JP6478736B2 - Packaging materials and products using the same - Google Patents

Description

  The present invention relates to a packaging material and a product using the same.

  Various multilayer structures have been developed as constituent materials for containers having gas barrier properties depending on the use of the container. The multilayer structure having gas barrier properties usually includes a base material and a gas barrier layer formed thereon.

  As a multilayer structure having a high gas barrier property, a multilayer structure including a transparent gas barrier layer constituted by a reaction product of aluminum oxide particles and a phosphorus compound is disclosed (see Patent Document 1).

  However, although the conventional multilayer structure is excellent in the initial gas barrier property, there are cases where defects such as cracks and pinholes are generated in the gas barrier layer when subjected to physical stress such as deformation or impact. . Therefore, the conventional multilayer structure may have insufficient gas barrier properties during actual use. The multilayer structure for constituting the container is often exposed to physical stress that causes a decrease in gas barrier properties. For example, when a food container is manufactured, the multilayer structure constituting the container is subjected to various physical stresses at each stage such as printing, laminating, bag making, food filling, transportation, display, and consumption.

  Patent Document 2 discloses a multilayer structure that has a high gas barrier property and can maintain the gas barrier property at a high level even when subjected to physical stress such as deformation or impact. However, there is currently a need for packaging materials that are more resistant to physical stress.

International publication 2011/122036 JP 2013-208794 A

  An object of the present invention is to provide a novel packaging material having high resistance to physical stress and a product using the same.

  As a result of intensive studies, the present inventors have found that the object can be achieved by using a multilayer structure including a specific layer, and have reached the present invention.

The present invention is a packaging material comprising a multilayer structure comprising a substrate (X) and a layer (Y) laminated on the substrate (X),
The layer (Y) contains a metal oxide (A), a phosphorus compound (B), and a cation ( _Z ) having an ionic value (F _Z ) of 1 or more and 3 or less,
The phosphorus compound (B) is a compound containing a site capable of reacting with the metal oxide (A),
In the layer (Y), the number of moles (N _M ) of the metal atoms (M) constituting the metal oxide (A) and the number of moles of phosphorus atoms (N _P ) derived from the phosphorus compound (B) Satisfy the relationship 0.8 ≦ N _M / N _P ≦ 4.5, and in the layer (Y), the number of moles (N _M ) and the number of moles of the cation (Z) (N _Z ) When the ionic valence and (F _Z), but provides a packaging material which satisfies the relationship of _{0.001 ≦ F Z × N Z /} N M ≦ 0.60.

  The cation (Z) is lithium ion, sodium ion, potassium ion, magnesium ion, calcium ion, titanium ion, zirconium ion, lanthanoid ion, vanadium ion, manganese ion, iron ion, cobalt ion, nickel ion, copper ion, It may be at least one cation selected from the group consisting of zinc ions, boron ions, aluminum ions, and ammonium ions.

  In the layer (Y), at least a part of the phosphorus compound (B) may react with the metal oxide (A). The phosphorus compound (B) is at least one compound selected from the group consisting of phosphoric acid, polyphosphoric acid, phosphorous acid, phosphonic acid, phosphonous acid, phosphinic acid, phosphinic acid, and derivatives thereof. There may be.

In the infrared absorption spectrum of the layer (Y), the maximum absorption wave number in the region of 800～1,400Cm ^-1 may be in the range of 1,080~1,130cm ^-1.

  The base material (X) may include at least one layer selected from the group consisting of a thermoplastic resin film layer, a paper layer, and an inorganic vapor deposition layer.

  The packaging material may further have a layer formed by extrusion coating lamination.

The oxygen permeability of the multilayer structure under the conditions of 20 ° C. and 85% RH may be 2 mL / (m ² · day · atm) or less.

The multilayer structure was held at 23 ° C. and 50% RH for 5 seconds with the multilayer structure stretched for 5 seconds, and the oxygen permeability of the multilayer structure at 20 ° C. and 85% RH was 4 mL / (m ² · day · atm) or less.

  The packaging material of the present invention may be a vertical bag-filling seal bag, a vacuum packaging bag, a pouch, a laminated tube container, an infusion bag, a paper container, a strip tape, a container lid, or an in-mold label container.

  Moreover, this invention provides the product which uses any one of the above-mentioned packaging materials for at least one part.

  The product of the present invention may include a content, wherein the content is a core material, the inside of the product is decompressed, and functions as a vacuum heat insulator.

  ADVANTAGE OF THE INVENTION According to this invention, the novel packaging material with high tolerance with respect to a physical stress and a product using the same are obtained. Moreover, the packaging material of the present invention and a product using the same are provided with a multilayer structure including a predetermined layer (Y), are excellent in both gas barrier properties and water vapor barrier properties, and have both barrier properties even after the stretching treatment. high. In the present specification, “gas barrier property” means the ability to barrier gas other than water vapor unless otherwise specified. Further, in this specification, when “barrier property” is simply described, it means both a gas barrier property and a water vapor barrier property.

It is a lineblock diagram of the vertical bag making filling seal bag concerning one embodiment of the present invention. It is a schematic sectional drawing of the vacuum packaging bag which concerns on one Embodiment of this invention. It is a lineblock diagram of a flat pouch concerning one embodiment of the present invention. It is a block diagram of the laminated tube container which concerns on one Embodiment of this invention. It is a lineblock diagram of the infusion bag concerning one embodiment of the present invention. It is a block diagram of the paper container which concerns on one Embodiment of this invention. It is a block diagram of the in-mold label container which concerns on one Embodiment of this invention. It is a schematic sectional drawing of the vacuum heat insulating body which concerns on one Embodiment of this invention. It is a schematic sectional drawing of the vacuum heat insulating body which concerns on other one Embodiment of this invention. It is a perspective view which shows typically a part of extrusion coat laminating apparatus of this invention.

  The present invention will be described below with examples. In the following description, substances, conditions, methods, numerical ranges, and the like may be exemplified, but the present invention is not limited to such examples. Moreover, as long as there is no note in particular, the substance illustrated may be used individually by 1 type, and may use 2 or more types together.

  Unless otherwise noted, in this specification, the meaning of “lamination of a specific layer on a specific member (substrate, layer, etc.)” means that the specific layer is in contact with the member. In addition to the case of laminating, the case where the specific layer is laminated above the member with another layer interposed therebetween is included. The same applies to “a specific layer is formed on a specific member (base material, layer, etc.)” and “a specific layer is arranged on a specific member (base material, layer, etc.)”. In addition, unless otherwise noted, the meaning of “application of a liquid (coating liquid, etc.) on a specific member (base material, layer, etc.)” means that the liquid is directly applied to the member. In addition, the case where the liquid is applied to another layer formed on the member is included.

  In this specification, like the “layer (Y)”, the layer (Y) may be distinguished from other layers by adding a reference (Y). Unless otherwise noted, the symbol (Y) has no technical meaning. The same applies to the substrate (X), the layer (W), the metal oxide (A), and other symbols. However, the case where it is clear to show a specific element like a hydrogen atom (H) is excluded.

[Packaging materials]
The packaging material of the present invention includes a multilayer structure including a base material (X) and a layer (Y) laminated on the base material (X). The packaging material may be constituted only by a multilayer structure. That is, in the following description, “packaging material” may be read as “multilayer structure”. Typically, “packaging material” can be read as “packaging”. The packaging material may be composed of a multilayer structure and other members.

  When the packaging material of the present invention is a packaging bag, a multilayer structure may be used for all of the packaging bags, or a multilayer structure may be used for a part of the packaging bag. For example, 50% to 100% of the area of the packaging bag may be constituted by a multilayer structure. The same applies when the packaging material is other than a packaging bag (container or lid material).

  The packaging material of the present invention can be produced by various methods. For example, a container (packaging material) is produced by joining a sheet-like multilayer structure or a film material containing the multilayer structure (hereinafter simply referred to as “film material”) and forming it into a predetermined container shape. May be. Examples of the molding method include thermoforming, injection molding, and extrusion blow molding. Moreover, you may produce a container (packaging material) by forming a layer (Y) on the base material (X) shape | molded by the shape of the predetermined | prescribed container. The container produced as described above may be referred to as a “packaging container” in the present specification.

[Products using packaging materials]
The packaging material of the present invention is used for at least a part of the product of the present invention. An example of the product of the present invention is a vacuum insulator. In the case where the product is a vacuum insulator including the contents, the contents are a core material, and the inside of the package is decompressed.

[Multilayer structure]
The multilayer structure of the present invention includes a base material (X) and a layer (Y) laminated on the base material (X). The layer (Y) contains a metal oxide (A), a phosphorus compound (B), and a cation ( _Z ) having an ionic value (F _Z ) of 1 or more and 3 or less. The phosphorus compound (B) contains a site capable of reacting with the metal oxide (A). In the multilayer structure of the present invention, in the layer (Y), the number of moles of metal atoms (M) constituting the metal oxide (A) (N _M ) and the number of moles of phosphorus atoms derived from the phosphorus compound (B). (N _P ) satisfies the relationship 0.8 ≦ N _M / N _P ≦ 4.5, and in the layer (Y), the number of moles of metal atoms (M) constituting the metal oxide (A) ( N _M ), the number of moles (N _Z ) of the cation (Z), and the ionic value (F _Z ) of the cation (Z) are 0.001 ≦ F _Z × N _Z / N _M ≦ 0.60 Satisfy the relationship. In addition, a metal atom (M) means all the metal atoms contained in a metal oxide (A). In the following description, unless otherwise noted, the phrase “multilayer structure” means a multilayer structure including a substrate (X) and a layer (Y).

The metal oxide (A) and the phosphorus compound (B) contained in the layer (Y) may be reacted. Further, the cation (Z) may form a salt with the phosphorus compound (B) in the layer (Y). In the case where the metal oxide (A) is reacted in the layer (Y), the part constituted by the metal oxide (A) in the reaction product is regarded as the metal oxide (A). When the phosphorus compound (B) is reacted in the layer (Y), the number of moles of phosphorus atoms derived from the phosphorus compound (B) in the reaction product is the number of phosphorus atoms derived from the phosphorus compound (B). It is included in the number of moles (N _P ). When the cation (Z) forms a salt in the layer (Y), the number of moles of the cation (Z) constituting the salt is included in the number of moles of the cation (Z) (N _Z ).

The multilayer structure of the present invention exhibits excellent barrier properties by satisfying the relationship of 0.8 ≦ N _M / N _P ≦ 4.5 in the layer (Y). In addition, the multilayer structure of the present invention satisfies the relationship of 0.001 ≦ F _Z × N _Z / N _M ≦ 0.60 in the layer (Y), so that the multilayer structure of the present invention can be stretched. Excellent barrier properties even after physical stress such as

The ratio (molar ratio) of N _M , N _P , and N _Z in the layer (Y) can be considered to be equal to those ratios used for producing the first coating liquid (U).

[Substrate (X)]
It does not restrict | limit especially in the material of base material (X), The base material which consists of various materials can be used. Examples of the material of the substrate (X) include resins such as thermoplastic resins and thermosetting resins; fiber aggregates such as fabrics and papers; wood; glass; metals; metal oxides and the like. The base material may have a composite structure or a multilayer structure made of a plurality of materials.

  Examples of the substrate include a group consisting of a thermoplastic resin film layer, a thermosetting resin film layer, a fiber polymer sheet (fabric, paper, etc.) layer, a wood sheet layer, a glass layer, an inorganic vapor deposition layer, and a metal foil layer. Examples thereof include a single-layer or multi-layer substrate including at least one kind of layer selected from the above. Among these, a base material including at least one layer selected from the group consisting of a thermoplastic resin film layer, a paper layer, and an inorganic vapor deposition layer is preferable. The base material in this case may be a single layer or a multilayer. The substrate (X) preferably includes a thermoplastic resin film layer, and may further include an inorganic vapor deposition layer (X ′) in addition to the thermoplastic resin film layer.

  Examples of the thermoplastic resin used for the substrate (X) include polyolefin resins such as polyethylene and polypropylene; polyester resins such as polyethylene terephthalate, polyethylene-2,6-naphthalate, polybutylene terephthalate and copolymers thereof. A polyamide-based resin such as nylon-6, nylon-66, or nylon-12; a hydroxyl group-containing polymer such as polyvinyl alcohol or ethylene-vinyl alcohol copolymer; polystyrene; poly (meth) acrylate; polyacrylonitrile; Polycarbonate, polyarylate, regenerated cellulose, polyimide, polyetherimide, polysulfone, polyethersulfone, polyetheretherketone, ionomer resin, and the like. The substrate is preferably at least one thermoplastic resin selected from the group consisting of polyethylene, polypropylene, polyethylene terephthalate, nylon-6, and nylon-66.

  When the film made of the thermoplastic resin is used as the base material (X), the base material (X) may be a stretched film or an unstretched film. A stretched film, particularly a biaxially stretched film is preferred because the processability (for example, suitability for printing and lamination) of the resulting multilayer structure is excellent. The biaxially stretched film may be a biaxially stretched film produced by any one of a simultaneous biaxial stretching method, a sequential biaxial stretching method, and a tubular stretching method.

  Examples of the paper used for the paper layer include craft paper, fine paper, imitation paper, glassine paper, parchment paper, synthetic paper, white board paper, Manila ball, milk carton base paper, cup base paper, ivory paper, and the like.

  The inorganic vapor deposition layer (X ′) preferably has a barrier property against oxygen and water vapor, and more preferably has a transparency. The inorganic vapor deposition layer (X ′) can be formed by vapor-depositing an inorganic substance. As the inorganic substance, for example, metal (for example, aluminum), metal oxide (for example, silicon oxide, aluminum oxide), metal nitride (for example, silicon nitride), metal nitride oxide (for example, silicon oxynitride), or metal Examples thereof include carbonitrides (for example, silicon carbonitride). Among these, an inorganic vapor deposition layer formed of aluminum oxide, silicon oxide, magnesium oxide, or silicon nitride is preferable from the viewpoint of excellent barrier properties against oxygen and water vapor.

  Although the thickness of inorganic vapor deposition layer (X ') changes with kinds of component which comprises inorganic vapor deposition layer (X'), it is preferable to exist in the range of 0.002-0.5 micrometer, and 0.005-0. More preferably, it is in the range of 2 μm, and still more preferably in the range of 0.01 to 0.1 μm. Within this range, a thickness that improves the barrier properties and mechanical properties of the multilayer structure may be selected. If the thickness of the inorganic vapor deposition layer (X ′) is less than 0.002 μm, the reproducibility of the development of the barrier property of the inorganic vapor deposition layer against oxygen or water vapor tends to be reduced, and the inorganic vapor deposition layer has sufficient barrier properties. May not be expressed. Further, if the thickness of the inorganic vapor deposition layer (X ′) exceeds 0.5 μm, the barrier property of the inorganic vapor deposition layer (X ′) tends to be lowered when the multilayer structure is pulled or bent. .

  The method for forming the inorganic vapor deposition layer (X ′) is not particularly limited. Physical methods such as vacuum vapor deposition (for example, resistance heating vapor deposition, electron beam vapor deposition, molecular beam epitaxy), sputtering, and ion plating are available. Vapor deposition may be used, thermal chemical vapor deposition (for example, catalytic chemical vapor deposition), photochemical vapor deposition, plasma chemical vapor deposition (for example, capacitively coupled plasma, inductively coupled plasma). , Surface wave plasma, electron cyclotron resonance, dual magnetron, atomic layer deposition, etc.), and chemical vapor deposition such as metal organic chemical vapor deposition. Further, an inorganic vapor deposition layer (X ′) may be deposited on the layer (Y).

When the substrate (X) is layered, the thickness thereof is preferably in the range of 1 to 1,000 μm from the viewpoint of improving the mechanical strength and workability of the resulting multilayer structure. More preferably in the range of 500 μm, still more preferably in the range of 9 to 200 μm.

[Layer (Y)]
The layer (Y) includes a metal oxide (A), a phosphorus compound (B), and a cation (Z) having an ionic value of 1 or more and 3 or less. Each component will be described below.

[Metal oxide (A)]
The metal atom (M) constituting the metal oxide (A) preferably has a valence of 2 or more. Examples of the metal atom (M) include a metal atom of Group 2 of the periodic table such as magnesium and calcium; a metal atom of Group 4 of the periodic table such as titanium and zirconium; a metal atom of Group 12 of the periodic table such as zinc; There can be mentioned group 13 metal atoms of the periodic table such as boron and aluminum; group 14 metal atoms of the periodic table such as silicon. Note that boron and silicon may be classified as metalloid atoms, but in this specification, these are included in metal atoms. The metal atom (M) may be one type or two or more types. Among these, the metal atom (M) is selected from the group consisting of aluminum, titanium, and zirconium because the productivity of the metal oxide (A) and the gas barrier property and water vapor barrier property of the resulting multilayer structure are more excellent. It is preferable that it is at least one kind, and aluminum is more preferable. That is, the metal atom (M) preferably contains aluminum.

  The total proportion of aluminum, titanium and zirconium in the metal atom (M) is usually 60 mol% or more, and may be 100 mol%. Further, the proportion of aluminum in the metal atom (M) is usually 50 mol% or more, and may be 100 mol%. The metal oxide (A) is produced by a method such as a liquid phase synthesis method, a gas phase synthesis method, or a solid pulverization method.

The metal oxide (A) may be a hydrolysis condensate of the compound (L) having a metal atom (M) to which a hydrolyzable characteristic group is bonded. Examples of the characteristic group include R ^{1 of} the general formula [I] described later. The hydrolysis condensate of compound (L) can be substantially regarded as the metal oxide (A). Therefore, in this specification, "metal oxide (A)" can be read as "hydrolysis condensate of compound (L)", and "hydrolysis condensate of compound (L)" It can also be read as “metal oxide (A)”.

[Compound (L) containing metal atom (M) to which a hydrolyzable characteristic group is bonded]
Since the control of the reaction with the phosphorus compound (B) becomes easy and the gas barrier property of the resulting multilayer structure is excellent, the compound (L) contains at least the compound (L ¹ ) represented by the following general formula [I]. It is preferable to include 1 type.
M ¹ (R ¹ ) _m (R ² ) _nm [I]
In the formula, M ¹ is selected from the group consisting of aluminum, titanium, and zirconium. R ¹ may have a halogen atom (fluorine atom, chlorine atom, bromine atom, iodine atom), NO ₃ , an optionally substituted alkoxy group having 1 to 9 carbon atoms, or a substituent. An acyloxy group having 1 to 9 carbon atoms, an alkenyloxy group having 3 to 9 carbon atoms which may have a substituent, a β-diketonato group having 5 to 15 carbon atoms which may have a substituent, or a substituent It is a diacylmethyl group having a C 1-9 acyl group which may have a group. R ² is an optionally substituted alkyl group having 1 to 9 carbon atoms, an optionally substituted aralkyl group having 7 to 10 carbon atoms, and an optionally substituted carbon. It is a C2-C10 aryl group which may have a C2-C9 alkenyl group or a substituent. m is an integer of 1 to n. n is equal to the valence of M ¹ . When a plurality of R ¹ are present, R ¹ may be the same as or different from each other. When a plurality of R ² are present, R ² may be the same as or different from each other.

Examples of the alkoxy group for R ¹ include methoxy group, ethoxy group, n-propoxy group, isopropoxy group, n-butoxy group, isobutoxy group, sec-butoxy group, tert-butoxy group, benzyloxy group, diphenylmethoxy group, Trityloxy group, 4-methoxybenzyloxy group, methoxymethoxy group, 1-ethoxyethoxy group, benzyloxymethoxy group, 2-trimethylsilylethoxy group, 2-trimethylsilylethoxymethoxy group, phenoxy group, 4-methoxyphenoxy group, etc. It is done.

Examples of the acyloxy group for R ¹ include an acetoxy group, ethylcarbonyloxy group, n-propylcarbonyloxy group, isopropylcarbonyloxy group, n-butylcarbonyloxy, isobutylcarbonyloxy group, sec-butylcarbonyloxy group, tert- A butylcarbonyloxy group, an n-octylcarbonyloxy group, etc. are mentioned.

Examples of the alkenyloxy group for R ¹ include allyloxy group, 2-propenyloxy group, 2-butenyloxy group, 1-methyl-2-propenyloxy group, 3-butenyloxy group, 2-methyl-2-propenyloxy group, 2-pentenyloxy group, 3-pentenyloxy group, 4-pentenyloxy group, 1-methyl-3-butenyloxy group, 1,2-dimethyl-2-propenyloxy group, 1,1-dimethyl-2-propenyloxy group 2-methyl-2-butenyloxy group, 3-methyl-2-butenyloxy group, 2-methyl-3-butenyloxy group, 3-methyl-3-butenyloxy group, 1-vinyl-2-propenyloxy group, 5-hexenyl An oxy group etc. are mentioned.

Examples of the β-diketonato group for R ¹ include a 2,4-pentanedionate group, a 1,1,1-trifluoro-2,4-pentanedionate group, 1,1,1,5,5,5. -Hexafluoro-2,4-pentanedionato group, 2,2,6,6-tetramethyl-3,5-heptaneedionate group, 1,3-butanedionato group, 2-methyl-1,3-butanedionato group, 2 -Methyl-1,3-butanedionato group, benzoylacetonato group and the like.

Examples of the acyl group of the diacylmethyl group of R ¹ include 1 to 6 carbon atoms such as formyl group, acetyl group, propionyl group (propanoyl group), butyryl group (butanoyl group), valeryl group (pentanoyl group), and hexanoyl group. An aliphatic acyl group (aroyl group) such as a benzoyl group or a toluoyl group.

Examples of the alkyl group for R ² include methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, sec-butyl group, tert-butyl group, n-pentyl group, isopentyl group, Examples include n-hexyl group, isohexyl group, 3-methylpentyl group, 2-methylpentyl group, 1,2-dimethylbutyl group, cyclopropyl group, cyclopentyl group, cyclohexyl group and the like.

Examples of the aralkyl group for R ² include a benzyl group and a phenylethyl group (phenethyl group).

Examples of the alkenyl group for R ² include a vinyl group, 1-propenyl group, 2-propenyl group, isopropenyl group, 3-butenyl group, 2-butenyl group, 1-butenyl group, and 1-methyl-2-propenyl group. 1-methyl-1-propenyl group, 1-ethyl-1-ethenyl group, 2-methyl-2-propenyl group, 2-methyl-1-propenyl group, 3-methyl-2-butenyl group, 4-pentenyl group Etc.

Examples of the aryl group for R ² include a phenyl group, a 1-naphthyl group, and a 2-naphthyl group.

Examples of the substituent for R ¹ and R ² include alkyl groups having 1 to 6 carbon atoms; methoxy group, ethoxy group, n-propoxy group, isopropoxy group, n-butoxy group, isobutoxy group, sec-butoxy group, an alkoxy group having 1 to 6 carbon atoms such as a tert-butoxy group, an n-pentyloxy group, an isopentyloxy group, an n-hexyloxy group, a cyclopropyloxy group, a cyclobutyloxy group, a cyclopentyloxy group, a cyclohexyloxy group; Methoxycarbonyl group, ethoxycarbonyl group, n-propoxycarbonyl group, isopropoxycarbonyl group, n-butoxycarbonyl group, isobutoxycarbonyl group, sec-butoxycarbonyl group, tert-butoxycarbonyl group, n-pentyloxycarbonyl group, iso Pentyloxycarboni Group, cyclopropyloxycarbonyl group, cyclobutyloxycarbonyl group, cyclopentyloxycarbonyl group, etc., C1-C6 alkoxycarbonyl group; phenyl group, tolyl group, naphthyl group, etc. aromatic hydrocarbon group; fluorine atom, Halogen atoms such as chlorine atom, bromine atom and iodine atom; acyl group having 1 to 6 carbon atoms; aralkyl group having 7 to 10 carbon atoms; aralkyloxy group having 7 to 10 carbon atoms; alkylamino having 1 to 6 carbon atoms Group; a dialkylamino group having an alkyl group having 1 to 6 carbon atoms, and the like.

R ¹ includes a halogen atom, NO ₃ , an optionally substituted alkoxy group having 1 to 6 carbon atoms, an optionally substituted acyloxy group having 1 to 6 carbon atoms, and a substituent. A diacylmethyl group having an optionally substituted β-diketonato group having 5 to 10 carbon atoms or an optionally substituted acyl group having 1 to 6 carbon atoms is preferable.

As R < ² >, the C1-C6 alkyl group which may have a substituent is preferable. M ¹ is preferably aluminum. When M ¹ is aluminum, m is preferably 3.

Specific examples of the compound (L ¹ ) include, for example, aluminum nitrate, aluminum acetate, tris (2,4-pentanedionato) aluminum, trimethoxyaluminum, triethoxyaluminum, tri-n-propoxyaluminum, triisopropoxyaluminum. , Aluminum compounds such as tri-n-butoxyaluminum, tri-sec-butoxyaluminum, tri-tert-butoxyaluminum; tetrakis (2,4-pentanedionato) titanium, tetramethoxytitanium, tetraethoxytitanium, tetraisopropoxytitanium , Titanium compounds such as tetra-n-butoxytitanium and tetrakis (2-ethylhexoxy) titanium; tetrakis (2,4-pentanedionato) zirconium, tetra-n-propoxyzirconium, teto Zirconium compounds such as -n- butoxy zirconium and the like. Among these, as the compound (L ¹ ), at least one compound selected from triisopropoxy aluminum and tri-sec-butoxy aluminum is preferable. A compound (L) may be used individually by 1 type, and may use 2 or more types together.

In the compound (L), the proportion of the compound (L ¹ ) in the compound (L) is not particularly limited as long as the effect of the present invention is obtained. The proportion of the compound other than the compound (L ¹ ) in the compound (L) is, for example, preferably 20 mol% or less, more preferably 10 mol% or less, further preferably 5 mol% or less, and even 0 mol%. Good.

  By hydrolyzing the compound (L), at least a part of the hydrolyzable characteristic group of the compound (L) is converted into a hydroxyl group. Furthermore, the hydrolyzate condenses to form a compound in which the metal atom (M) is bonded through the oxygen atom (O). When this condensation is repeated, a compound that can be substantially regarded as a metal oxide is formed. In addition, a hydroxyl group usually exists on the surface of the metal oxide (A) thus formed.

  In the present specification, a compound having a ratio of [number of moles of oxygen atom (O) bonded only to metal atom (M)] / [number of moles of metal atom (M)] of 0.8 or more is metal. It shall be included in oxide (A). Here, the oxygen atom (O) bonded only to the metal atom (M) is the oxygen atom (O) in the structure represented by MOM, and the structure represented by MOH. Oxygen atoms bonded to metal atoms (M) and hydrogen atoms (H) such as oxygen atoms (O) in are excluded. The ratio in the metal oxide (A) is preferably 0.9 or more, more preferably 1.0 or more, and further preferably 1.1 or more. Although the upper limit of this ratio is not particularly limited, it is usually represented by n / 2, where n is the valence of the metal atom (M).

  In order for the hydrolysis condensation to occur, it is important that the compound (L) has a hydrolyzable characteristic group. When these groups are not bonded, the hydrolysis condensation reaction does not occur or becomes extremely slow, making it difficult to prepare the target metal oxide (A).

  The hydrolyzed condensate of compound (L) may be produced from a specific raw material by, for example, a method adopted in a known sol-gel method. The raw materials include compound (L), partial hydrolyzate of compound (L), complete hydrolyzate of compound (L), partial hydrolyzed condensate of compound (L), and complete hydrolysis of compound (L). At least one selected from the group consisting of products in which a part of the product is condensed can be used.

[Phosphorus Compound (B)]
The phosphorus compound (B) contains a site capable of reacting with the metal oxide (A), and typically contains a plurality of such sites. As described above, the phosphorus compound (B) is preferably an inorganic phosphorus compound. The phosphorus compound (B) is preferably a compound containing 2 to 20 sites (atomic groups or functional groups) capable of reacting with the metal oxide (A). Such a part includes a part capable of undergoing a condensation reaction with a functional group (for example, a hydroxyl group) present on the surface of the metal oxide (A). Examples of such a site include a halogen atom directly bonded to a phosphorus atom, an oxygen atom directly bonded to a phosphorus atom, and the like. The functional group (for example, hydroxyl group) present on the surface of the metal oxide (A) is usually bonded to the metal atom (M) constituting the metal oxide (A).

  Examples of the phosphorus compound (B) include phosphoric acid, polyphosphoric acid condensed with 4 or more molecules of phosphoric acid, phosphorous acid, phosphonic acid, phosphonous acid, phosphinic acid, phosphinic acid, and the like, and These salts (for example, sodium phosphate), and derivatives thereof (for example, halides (for example, phosphoryl chloride), dehydrates (for example, diphosphorus pentoxide)) and the like can be mentioned.

  A phosphorus compound (B) may be used individually by 1 type, and may use 2 or more types together. Among these phosphorus compounds (B), it is preferable to use phosphoric acid alone or to use phosphoric acid and other phosphorus compounds (B) in combination. By using phosphoric acid, the stability of the first coating liquid (U) described later and the gas barrier property and water vapor barrier property of the resulting multilayer structure are improved.

[Ratio of metal oxide (A) and phosphorus compound (B)]
In the multilayer structure of the present invention, in the layer (Y), N _M and N _P satisfy the relationship of 0.8 ≦ N _M / N _P ≦ 4.5, and 1.0 ≦ N _M / Those satisfying the relationship of N _P ≦ 3.6 are preferable, and those satisfying the relationship of 1.1 ≦ N _M / N _P ≦ 3.0 are more preferable. When the value of N _M / N _P exceeds 4.5, the metal oxide (A) becomes excessive with respect to the phosphorus compound (B), and the bond between the metal oxide (A) and the phosphorus compound (B) is not good. In addition, since the amount of hydroxyl groups present on the surface of the metal oxide (A) increases, the gas barrier property and its stability tend to decrease. On the other hand, if the value of N _M / N _P is less than 0.8, the phosphorus compound (B) is excessive with respect to the metal oxide (A), and is not excessively involved in the bond with the metal oxide (A). The amount of the phosphorus compound (B) increases and the amount of the hydroxyl group derived from the phosphorus compound (B) tends to increase, and the barrier property and its stability tend to decrease.

In addition, the said ratio can be adjusted with ratio of the quantity of a metal oxide (A) and the quantity of a phosphorus compound (B) in the 1st coating liquid (U) for forming a layer (Y). The ratio of N _M and N _P in the layer (Y) is usually the moles of phosphorus compound of a metal atom (M) in which there the ratio of the first coating liquid (U) constituting a metal oxide (A) ( It is the same as the ratio to the number of moles of phosphorus atoms constituting B).

[Reaction product (D)]
A reaction product (D) is obtained by reaction of a metal oxide (A) and a phosphorus compound (B). Here, the compound produced by the reaction of the metal oxide (A), the phosphorus compound (B), and another compound is also included in the reaction product (D). The reaction product (D) may partially contain the metal oxide (A) and / or the phosphorus compound (B) that are not involved in the reaction.

[Cation (Z)]
The cation number (F Z) of the cation ( _Z ) is 1 or more and 3 or less. When resistance to hot water as well as physical stress is required, such as retort treatment, the ionic value (F _Z ) is preferably 2 or more and 3 or less, more preferably 3. The cation (Z) is a cation containing an element in the second to seventh periods of the periodic table. Examples of the cation (Z) include lithium ion, sodium ion, potassium ion, magnesium ion, calcium ion, titanium ion, zirconium ion, lanthanoid ion (for example, lanthanum ion), vanadium ion, manganese ion, iron ion, and cobalt. Examples include ions, nickel ions, copper ions, zinc ions, boron ions, aluminum ions, and ammonium ions. Among them, magnesium ions, calcium ions, lanthanoid ions (for example, lanthanum ions), zinc ions, and boron ions are preferable. One kind of cation (Z) may be included, or two or more kinds may be included. The function of the cation (Z) is not clear at present. In one hypothesis, the cation (Z) has an ionic bond with a hydroxyl group of another metal oxide (A) or phosphorus compound (B) via a hydroxyl group of the metal oxide (A) or phosphorus compound (B). By forming, it is thought that the tolerance with respect to the physical stress of a layer (Y) is improved. Therefore, when higher tolerance is required, it is preferable to use a cation having a large ionic valence (F _Z ) capable of forming more ionic bonds.

Incidentally, the cation (Z) is, if the ion valence includes a plurality of different kinds of cations, the value of F _Z × N _Z is obtained by summing the values calculated for each cation. For example, when the cation (Z) contains 1 mol of sodium ion (Na ⁺ ) and 2 mol of calcium ion (Ca ²⁺ ), F _Z × N _Z = 1 × 1 + 2 × 2 = 5.

  The cation (Z) can be added to the layer (Y) by dissolving the ionic compound (E) that generates the cation (Z) when dissolved in the solvent in the first coating liquid (U). Examples of the cation (Z) counter ions include inorganic anions such as hydroxide ions, chloride ions, sulfate ions, hydrogen sulfate ions, nitrate ions, carbonate ions and hydrogen carbonate ions; acetate ions and stearate ions. And organic acid anions such as oxalate ion and tartrate ion. The ionic compound (E) of the cation (Z) is a metal compound (Ea) or metal oxide (Eb) (excluding the metal oxide (A)) that generates a cation (Z) when dissolved. Also good.

[Ratio of metal oxide (A) to cation (Z)]
In the multilayer structure of the present invention, in the layer (Y), F _Z , N _Z, and N _M satisfy the relationship of 0.001 ≦ F _Z × N _Z / N _M ≦ 0.60. Those satisfying the relationship of 0.001 ≦ F _Z × N _Z / N _M ≦ 0.30 are preferable, and those satisfying the relationship of 0.01 ≦ F _Z × N _Z / N _M ≦ 0.30 are more preferable.

[Ratio of phosphorus compound (B) to cation (Z)]
In the multilayer structure of the present invention, in the layer (Y), F _Z , N _Z and N _P preferably satisfy the relationship of 0.0008 ≦ F _Z × N _Z / N _P ≦ 1.35. Those satisfying the relationship of 001 ≦ F _Z × N _Z / N _P ≦ 1.00 are more preferable, those satisfying the relationship of 0.0012 ≦ F _Z × N _Z / N _P ≦ 0.35 are more preferable. Those satisfying the relationship of 012 ≦ F _Z × N _Z / N _P ≦ 0.29 are particularly preferable.

[Polymer (C)]
The layer (Y) may further contain a specific polymer (C). The polymer (C) is, for example, a polymer containing at least one functional group selected from the group consisting of a carbonyl group, a hydroxyl group, a carboxyl group, a carboxylic anhydride group, and a carboxyl group salt.

  Examples of the polymer (C) include polyketone; polyvinyl alcohol, modified polyvinyl alcohol containing 1 to 50 mol% of an α-olefin unit having 4 or less carbon atoms, and polyvinyl alcohol weight such as polyvinyl acetal (for example, polyvinyl butyral). Polysaccharides such as cellulose, starch, cyclodextrin; (meth) acrylic acid polymers such as poly (meth) acrylic acid hydroxyethyl, poly (meth) acrylic acid, ethylene-acrylic acid copolymer; ethylene-anhydrous Examples thereof include maleic acid polymers such as hydrolyzate of maleic acid copolymer, hydrolyzate of styrene-maleic anhydride copolymer, hydrolyzate of alternating isobutylene-maleic anhydride copolymer, and the like. Among these, polyvinyl alcohol polymers are preferable, and specifically, modified polyvinyl alcohol containing 1 to 15 mol% of polyvinyl alcohol and an α-olefin unit having 4 or less carbon atoms is preferable.

Although it does not specifically limit as a saponification degree of a polyvinyl alcohol-type polymer, 75.0-99.85 mol% is preferable and 80.0-99.5 mol% is more preferable. The viscosity average degree of polymerization of the polyvinyl alcohol polymer is preferably from 100 to 4,000, more preferably from 300 to 3,000. Moreover, 1.0-200 mPa * s is preferable and, as for the viscosity of the 4 mass% aqueous solution at 20 degreeC of a polyvinyl alcohol-type polymer, 11-90 mPa * s is more preferable.
The saponification degree, the viscosity average polymerization degree, and the viscosity of the 4% by mass aqueous solution are values obtained according to JIS K 6726 (1994).

  The polymer (C) may be a homopolymer of a monomer having a polymerizable group (for example, vinyl acetate or acrylic acid), or may be a copolymer of two or more monomers. Alternatively, it may be a copolymer of a monomer having a carbonyl group, a hydroxyl group and / or a carboxyl group and a monomer having no such group.

  There is no restriction | limiting in particular in the molecular weight of a polymer (C). In order to obtain a multilayer structure having better barrier properties and mechanical properties (for example, drop impact strength), the number average molecular weight of the polymer (C) is preferably 5,000 or more, and 8, More preferably, it is 000 or more, and it is still more preferable that it is 10,000 or more. The upper limit of the number average molecular weight of the polymer (C) is not particularly limited, and is, for example, 1,500,000 or less.

  In order to further improve the barrier properties, the content of the polymer (C) in the layer (Y) is preferably 50% by mass or less, based on the mass of the layer (Y) (100% by mass). It is more preferably at most mass%, more preferably at most 30 mass%, and may be at most 20 mass%. The polymer (C) may or may not react with the other components in the layer (Y).

[Other components in layer (Y)]
The layer (Y) in the multilayer structure comprises a metal oxide (A), a compound (L), a phosphorus compound (B), a reaction product (D), a cation (Z) or its compound (E), an acid ( In addition to the acid catalyst used for the hydrolysis condensation, the acid during peptization, etc.) and the polymer (C), other components may be included. Examples of other components include inorganic acid metal salts such as carbonates, hydrochlorides, nitrates, hydrogen carbonates, sulfates, hydrogen sulfates, borates and the like that do not contain cations (Z); cations (Z) Organic acid metal salts such as acetates, stearates, oxalates, tartrates, etc. that do not contain amides; layered clay compounds; crosslinking agents; polymer compounds other than polymer (C); plasticizers; antioxidants; Agents; flame retardants and the like. The content of the other component in the layer (Y) in the multilayer structure is preferably 50% by mass or less, more preferably 20% by mass or less, based on the mass of the layer (Y). The content is more preferably 10% by mass or less, particularly preferably 5% by mass or less, and may be 0% by mass (excluding other components).

[Thickness of layer (Y)]
The thickness of the layer (Y) (when the multilayer structure has two or more layers (Y), the total thickness of each layer (Y)) is preferably 0.05 to 4.0 μm, More preferably, it is 0.1-2.0 micrometers. By making the layer (Y) thin, the dimensional change of the multilayer structure during processing such as printing and laminating can be kept low. Further, since the flexibility of the multilayer structure is increased, the mechanical characteristics can be brought close to the mechanical characteristics of the substrate itself. When the multilayer structure of the present invention has two or more layers (Y), the thickness per layer (Y) is preferably 0.05 μm or more from the viewpoint of gas barrier properties. The thickness of the layer (Y) can be controlled by the concentration of the first coating liquid (U) described later used for forming the layer (Y) and the coating method.

[Infrared absorption spectrum of layer (Y)]
In the infrared absorption spectrum of the layer (Y), the maximum absorption wave number in the region of 800～1,400Cm ^-1 is preferably in the range of 1,080~1,130cm ^-1. In the process in which the metal oxide (A) and the phosphorus compound (B) react to form a reaction product (D), the metal atom (M) derived from the metal oxide (A) and the phosphorus compound (B) To form a bond represented by M-O-P bonded with an oxygen atom (O). As a result, a characteristic absorption band derived from the bond is generated in the infrared absorption spectrum. As a result of the study by the present inventors, when the absorption band based on the M—O—P bond is found in the region of 1,080 to 1,130 cm ⁻¹ , the obtained multilayer structure has excellent gas barrier properties. Was found to be expressed. In particular, when the characteristic absorption band is the strongest absorption in a region of 800 to 1,400 cm ⁻¹ where absorption derived from bonds between various atoms and oxygen atoms is generally observed, the obtained multilayer structure Was found to exhibit even better gas barrier properties.

On the other hand, when a metal compound such as a metal alkoxide or a metal salt and a phosphorus compound (B) are mixed in advance and then hydrolytically condensed, the metal atom derived from the metal compound and the phosphorus compound (B) are derived. A complex in which phosphorus atoms are mixed and reacted almost uniformly is obtained. In that case, in the infrared absorption spectrum, the maximum absorption wave number in the region of 800～1,400Cm ^-1 comes to deviate from the scope of 1,080~1,130cm ^-1.

In the infrared absorption spectrum of the layer (Y), the half-value width of the maximum absorption band in the region of 800～1,400Cm ^-1 from gas barrier property aspect of the resulting multilayer structure, 200 cm ^-1 or less is preferable, 150 cm ^-1 The following is more preferable, 100 cm ⁻¹ or less is more preferable, and 50 cm ⁻¹ or less is particularly preferable.

  The infrared absorption spectrum of the layer (Y) can be measured by the method described in Examples. However, when measurement by the method described in Examples is not possible, reflection measurement such as reflection absorption method, external reflection method, attenuated total reflection method, etc., scraping the layer (Y) from the multilayer structure, Nujol method, tablet method, etc. Although it may measure by the method of transmission measurement, it is not limited to these.

[Layer (W)]
The multilayer structure of the present invention may further include a layer (W). The layer (W) includes a polymer (G1) having a functional group containing a phosphorus atom. The layer (W) is preferably disposed adjacent to the layer (Y). That is, the layer (W) and the layer (Y) are preferably arranged so as to contact each other. Moreover, it is preferable that a layer (W) is arrange | positioned on the opposite side (preferably surface on the opposite side) from the base material (X) on both sides of a layer (Y). In other words, the layer (Y) is preferably disposed between the base material (X) and the layer (W). In a preferred example, the layer (W) is disposed on the opposite side (preferably the surface on the opposite side) of the substrate (X) with the layer (Y) in between, and is disposed adjacent to the layer (Y). . The layer (W) may further contain a polymer (G2) having a hydroxyl group and / or a carboxyl group. As the polymer (G2), the same polymer (C) can be used. The polymer (G1) will be described below.

[Polymer (G1)]
Examples of the functional group containing a phosphorus atom that the polymer (G1) having a functional group containing a phosphorus atom has include a phosphoric acid group, a phosphorous acid group, a phosphonic acid group, a phosphonous acid group, a phosphinic acid group, Examples thereof include phosphinic acid groups and salts thereof, and functional groups derived therefrom (for example, (partial) ester compounds, halides (for example, chloride), dehydrates) and the like. Among these, a phosphoric acid group and / or a phosphonic acid group are preferable, and a phosphonic acid group is more preferable.

  Examples of the polymer (G1) include 6-[(2-phosphonoacetyl) oxy] hexyl acrylate, 2-phosphonooxyethyl methacrylate, phosphonomethyl methacrylate, 11-phosphonoundecyl methacrylate, and methacrylic acid 1 Polymers of phosphono (meth) acrylates such as 1,1-diphosphonoethyl; heavy phosphonic acids such as vinylphosphonic acid, 2-propene-1-phosphonic acid, 4-vinylbenzylphosphonic acid, 4-vinylphenylphosphonic acid Polymers of phosphinic acids such as vinyl phosphinic acid and 4-vinylbenzyl phosphinic acid; phosphorylated starch and the like. The polymer (G1) may be a homopolymer of a monomer having at least one phosphorus atom-containing functional group, or may be a copolymer of two or more types of monomers. Further, as the polymer (G1), two or more kinds of polymers composed of a single monomer may be mixed and used. Among these, polymers of phosphono (meth) acrylic acid esters and / or polymers of vinyl phosphonic acids are preferable, and polymers of vinyl phosphonic acids are more preferable. The polymer (G1) is preferably poly (vinylphosphonic acid) or poly (2-phosphonooxyethyl methacrylate), and may be poly (vinylphosphonic acid). The polymer (G1) can also be obtained by hydrolyzing a vinylphosphonic acid derivative such as a vinylphosphonic acid halide or a vinylphosphonic acid ester alone or copolymerized.

  The polymer (G1) may be a copolymer of a monomer having at least one phosphorus atom-containing functional group and another vinyl monomer. Other vinyl monomers that can be copolymerized with a monomer having a phosphorus atom-containing functional group include, for example, (meth) acrylic acid, (meth) acrylic acid esters, acrylonitrile, methacrylonitrile, styrene, Examples include nucleus-substituted styrenes, alkyl vinyl ethers, alkyl vinyl esters, perfluoroalkyl vinyl ethers, perfluoroalkyl vinyl esters, maleic acid, maleic anhydride, fumaric acid, itaconic acid, maleimide, and phenylmaleimide. Among these, (meth) acrylic acid esters, acrylonitrile, styrene, maleimide, and phenylmaleimide are preferable.

  In order to obtain a multilayer structure having better bending resistance, the proportion of the structural unit derived from the monomer having a phosphorus atom-containing functional group in the total structural unit of the polymer (G1) is 10 mol% or more. It is preferably 20 mol% or more, more preferably 40 mol% or more, particularly preferably 70 mol% or more, and may be 100 mol%.

  Although there is no restriction | limiting in particular in the molecular weight of a polymer (G1), It is preferable that a number average molecular weight exists in the range of 1,000-100,000. When the number average molecular weight is in this range, it is possible to achieve both the improvement effect of the bending resistance by laminating the layer (W) and the viscosity stability of the second coating liquid (V) described later at a high level. it can. Moreover, when laminating | stacking the layer (Y) mentioned later, when the molecular weight of the polymer (G1) per phosphorus atom exists in the range of 100-500, the improvement effect of bending resistance can be heightened more.

  The layer (W) may be composed only of the polymer (G1), may be composed only of the polymer (G1) and the polymer (G2), or may further include other components. Examples of other components contained in the layer (W) include inorganic acid metal salts such as carbonates, hydrochlorides, nitrates, hydrogen carbonates, sulfates, hydrogen sulfates and borates; acetates and stearates. Organic acid metal salts such as oxalate and tartrate; metal complexes such as cyclopentadienyl metal complexes (for example, titanocene) and cyano metal complexes (for example, Prussian blue); layered clay compounds; cross-linking agents; Polymer compounds other than G1) and the polymer (G2): plasticizers; antioxidants; ultraviolet absorbers; flame retardants and the like. The content of the other components in the layer (W) is preferably 50% by mass or less, more preferably 20% by mass or less, further preferably 10% by mass or less, and further preferably 5% by mass. The following is particularly preferable, and may be 0% by mass (excluding other components). The layer (W) does not contain at least one of the metal oxide (A), the phosphorus compound (B), and the cation (Z). Typically, the layer (W) does not contain at least the metal oxide (A).

  From the viewpoint of maintaining a good appearance of the multilayer structure, the content of the polymer (G2) in the layer (W) is 85% by mass or less based on the mass of the layer (W) (100% by mass). It is preferably 50% by mass or less, more preferably 20% by mass or less, and particularly preferably 10% by mass or less. The polymer (G2) may or may not react with the component in the layer (W). The mass ratio of the polymer (G1) and the polymer (G2) is preferably such that polymer (G1): polymer (G2) is in the range of 15:85 to 100: 0, and 15:85 to 99: More preferably, it is in the range of 1.

  The thickness per layer of the layer (W) is preferably 0.003 μm or more from the viewpoint of better resistance to physical stress (for example, bending) of the multilayer structure of the present invention. The upper limit of the thickness of the layer (W) is not particularly limited, but the effect of improving resistance to physical stress reaches saturation at 1.0 μm or more. Therefore, the upper limit of the total thickness of the layer (W) is preferably 1.0 μm from the viewpoint of economy. The thickness of the layer (W) can be controlled by the concentration of a second coating liquid (V) described later used for forming the layer (W) and the coating method.

[Method for producing multilayer structure]
According to the manufacturing method of the present invention, the multilayer structure of the present invention can be easily manufactured. Since the matters described for the multilayer structure of the present invention can be applied to the production method of the present invention, redundant description may be omitted. In addition, the matters described for the manufacturing method of the present invention can be applied to the multilayer structure of the present invention.

  The method for producing a multilayer structure of the present invention includes steps [I], [II] and [III]. In the step [I], the metal oxide (A), the phosphorus compound (B), and the ionic compound (E) of the cation (Z) are mixed, whereby the metal oxide (A), the phosphorus compound ( A first coating liquid (U) containing B) and a cation (Z) is prepared. In step [II], the first coating liquid (U) is applied on the base material (X) to form a precursor layer of the layer (Y) on the base material (X). In step [III], the precursor layer is heat-treated at a temperature of 110 ° C. or higher to form a layer (Y) on the substrate (X).

[Step [I] (Preparation of first coating liquid (U))]
In the step [I], the metal oxide (A), the phosphorus compound (B), and the ionic compound (E) of the cation (Z) are mixed. In mixing these, a solvent may be added. In the first coating liquid (U), a cation (Z) is generated from the ionic compound (E). The first coating liquid (U) may contain other compounds in addition to the metal oxide (A), the phosphorus compound (B), and the cation (Z).

The first coating solution in (U), and N _M and N _P, it is preferable to satisfy the above relationship. N _M , N _Z, and F _Z preferably satisfy the above relational expression. Further, it is preferable that N _P , N _Z, and F _Z satisfy the above relational expression.

The step [I] preferably includes the following steps [Ia] to [Ic].
Step [Ia]: a step of preparing a liquid containing the metal oxide (A),
Step [Ib]: a step of preparing a solution containing the phosphorus compound (B),
Step [Ic]: A step of mixing the liquid containing the metal oxide (A) obtained in the steps [Ia] and [Ib] and the solution containing the phosphorus compound (B).

  Step [Ib] may be performed either before or after step [Ia], or may be performed simultaneously with step [Ia]. Hereinafter, each step will be described more specifically.

  In the step [Ia], a liquid containing the metal oxide (A) is prepared. The liquid is a solution or a dispersion. The liquid is, for example, mixed with the above-described compound (L), water, and, if necessary, an acid catalyst or an organic solvent in accordance with a technique adopted in a known sol-gel method, to condense the compound (L) or It can be prepared by hydrolytic condensation. When a dispersion of the metal oxide (A) is obtained by condensing or hydrolyzing the compound (L), a specific treatment (such as peptization or concentration as described above) is performed on the dispersion as necessary. The solvent may be adjusted for control). Step [Ia] may include a step of condensing (for example, dehydrating condensation) at least one selected from the group consisting of compound (L) and a hydrolyzate of compound (L). There is no restriction | limiting in particular in the kind of organic solvent which can be used in process [Ia], For example, alcohol, such as methanol, ethanol, isopropanol, water, and these mixed solvents are preferable. The content of the metal oxide (A) in the liquid is preferably in the range of 0.1 to 30% by mass, more preferably in the range of 1 to 20% by mass, and 2 to 15% by mass. More preferably, it is in the range.

  For example, when the metal oxide (A) is aluminum oxide, the preparation of the aluminum oxide dispersion is performed by first hydrolyzing and condensing the aluminum alkoxide in an aqueous solution adjusted to pH with an acid catalyst as necessary. A slurry is obtained. Next, the slurry is peptized in the presence of a specific amount of acid to obtain a dispersion of aluminum oxide. In addition, the dispersion liquid of the metal oxide (A) containing metal atoms other than aluminum can also be manufactured by the same method. As the acid, for example, hydrochloric acid, sulfuric acid, nitric acid, acetic acid, lactic acid and butyric acid are preferable, and nitric acid and acetic acid are more preferable.

  In step [Ib], a solution containing the phosphorus compound (B) is prepared. The solution can be prepared by dissolving the phosphorus compound (B) in a solvent. When the solubility of the phosphorus compound (B) is low, dissolution may be promoted by heat treatment or ultrasonic treatment. The solvent may be appropriately selected according to the type of the phosphorus compound (B), but preferably contains water. The solvent may contain an organic solvent (for example, methanol) as long as it does not hinder the dissolution of the phosphorus compound (B).

  The content of the phosphorus compound (B) in the solution containing the phosphorus compound (B) is preferably in the range of 0.1 to 99% by mass, more preferably in the range of 45 to 95% by mass, 55 More preferably, it is in the range of -90% by mass.

  In the step [Ic], a liquid containing the metal oxide (A) and a solution containing the phosphorus compound (B) are mixed. By maintaining the temperature at the time of mixing at 30 ° C. or lower (for example, 20 ° C.), the first coating liquid (U) having excellent storage stability may be obtained.

  Compound (E) containing a cation (Z) may be added in at least one step selected from the group consisting of step [Ia], step [Ib], and step [Ic]. However, it may be added in any one of them. For example, the compound (E) may be added to the liquid containing the metal oxide (A) in the step [Ia] or the solution containing the phosphorus compound (B) in the step [Ib]. -C] may be added to a mixed solution of the liquid containing the metal oxide (A) and the solution containing the phosphorus compound (B).

  Further, the first coating liquid (U) may contain a polymer (C). The method for including the polymer (C) in the first coating liquid (U) is not particularly limited. For example, the polymer (C) may be added and mixed as a solution to any one of the liquid containing the metal oxide (A), the solution containing the phosphorus compound (B), and the mixed solution thereof. You may make it melt | dissolve, after adding in the state of a pellet. Metal oxide (A) when liquid containing metal oxide (A) and solution containing phosphorus compound (B) are mixed by containing polymer (C) in a solution containing phosphorus compound (B) As a result, the first coating liquid (U) having excellent stability over time may be obtained.

  The first coating liquid (U) may contain at least one acid compound (J) selected from the group consisting of hydrochloric acid, nitric acid, acetic acid, trifluoroacetic acid, and trichloroacetic acid, if necessary. The content of the acid compound (J) is preferably in the range of 0.1 to 5.0% by mass, and more preferably in the range of 0.5 to 2.0% by mass. Within these ranges, the effect of adding the acid compound (J) can be obtained, and the acid compound (J) can be easily removed. When the acid component remains in the liquid containing the metal oxide (A), the addition amount of the acid compound (J) may be determined in consideration of the residual amount.

  The mixed liquid obtained in the step [Ic] can be used as it is as the first coating liquid (U). In this case, normally, the solvent contained in the liquid containing the metal oxide (A) or the solution containing the phosphorus compound (B) is the solvent for the first coating liquid (U). Further, the first coating liquid (U) may be prepared by performing treatments such as addition of an organic solvent, adjustment of pH, adjustment of viscosity, addition of additives, and the like on the mixed solution. As an organic solvent, the solvent etc. which are used for preparation of the solution containing a phosphorus compound (B) are mentioned, for example.

  From the viewpoint of the storage stability of the first coating liquid (U) and the coating properties of the first coating liquid (U) on the substrate (X), the solid content concentration of the first coating liquid (U) is 1 to 20 It is preferably in the range of mass%, more preferably in the range of 2 to 15 mass%, still more preferably in the range of 3 to 10 mass%. The solid content concentration of the first coating liquid (U) is, for example, adding a predetermined amount of the first coating liquid (U) to the petri dish, heating the petri dish to remove volatile components such as a solvent, and the remaining solid mass Is calculated by dividing by the mass of the first coating liquid (U) added first.

  The first coating liquid (U) has a viscosity measured with a Brookfield rotational viscometer (SB type viscometer: rotor No. 3, rotation speed 60 rpm) at a coating temperature of 3,000 mPa · s or less. Preferably, it is 2,500 mPa · s or less, and more preferably 2,000 mPa · s or less. When the viscosity is 3,000 mPa · s or less, the leveling property of the first coating liquid (U) is improved, and a multilayer structure that is more excellent in appearance can be obtained. Moreover, as a viscosity of a 1st coating liquid (U), 50 mPa * s or more is preferable, 100 mPa * s or more is more preferable, 200 mPa * s or more is further more preferable.

In the first coating liquid (U), N _M and N _P satisfy the relationship 0.8 ≦ N _M / N _P ≦ 4.5. In the first coating liquid (U), N _M , N _Z, and F _Z satisfy the relationship of 0.001 ≦ F _Z × N _Z / N _M ≦ 0.60. Furthermore, in the first coating liquid (U), it is preferable that F _Z , N _Z, and N _P satisfy the relationship of 0.0008 ≦ F _Z × N _Z / N _P ≦ 1.35.

[Step [II] (Coating of first coating liquid (U))]
In step [II], the first coating liquid (U) is applied on the base material (X) to form a precursor layer of the layer (Y) on the base material (X). The first coating liquid (U) may be applied directly on at least one surface of the substrate (X). Before applying the first coating liquid (U), the surface of the substrate (X) is treated with a known anchor coating agent, or a known adhesive is applied to the surface of the substrate (X). For example, the adhesive layer (H) may be formed on the surface of the substrate (X).

  The method for coating the first coating liquid (U) on the substrate (X) is not particularly limited, and a known method can be employed. Coating methods include, for example, casting method, dipping method, roll coating method, gravure coating method, screen printing method, reverse coating method, spray coating method, kiss coating method, die coating method, metalling bar coating method, chamber doctor combined coating Method, curtain coating method, and the like.

  Usually, in the step [II], the precursor layer of the layer (Y) is formed by removing the solvent in the first coating liquid (U). There is no restriction | limiting in particular in the removal method of a solvent, A well-known drying method is applicable. Examples of the drying method include a hot air drying method, a hot roll contact method, an infrared heating method, and a microwave heating method. The drying treatment temperature is preferably 0 to 15 ° C. or lower than the flow start temperature of the substrate (X). When the first coating liquid (U) contains the polymer (C), the drying treatment temperature is preferably 15 to 20 ° C. lower than the thermal decomposition start temperature of the polymer (C). The drying treatment temperature is preferably in the range of 70 to 200 ° C, more preferably in the range of 80 to 180 ° C, and further preferably in the range of 90 to 160 ° C. The removal of the solvent may be carried out under normal pressure or reduced pressure. Further, the solvent may be removed by a heat treatment in step [III] described later.

  When laminating the layer (Y) on both surfaces of the layered substrate (X), the first coating liquid (U) is applied to one surface of the substrate (X), and then the first is removed by removing the solvent. (The precursor layer of the first layer (Y)), and after applying the first coating liquid (U) to the other surface of the substrate (X), the solvent is then removed. A second layer (a precursor layer of the second layer (Y)) may be formed. The composition of the first coating liquid (U) applied to each surface may be the same or different.

[Step [III] (Treatment of precursor layer of layer (Y))]
In step [III], the precursor layer (precursor layer of layer (Y)) formed in step [II] is heat-treated at a temperature of 140 ° C. or higher to form layer (Y). This heat treatment temperature is preferably higher than the drying treatment temperature after the application of the first coating liquid (U).

  In the step [III], a reaction in which the metal oxides (A) are bonded through phosphorus atoms (phosphorus atoms derived from the phosphorus compound (B)) proceeds. From another point of view, in the step [III], the reaction reaction of the reaction product (D) proceeds. In order to sufficiently proceed with the reaction, the temperature of the heat treatment is preferably 140 ° C. or higher, more preferably 170 ° C. or higher, and further preferably 180 ° C. or higher. If the heat treatment temperature is low, it takes a long time to obtain a sufficient degree of reactivity, which causes a decrease in productivity. The preferable upper limit of the temperature of heat processing changes with kinds etc. of base material (X). For example, when a thermoplastic resin film made of a polyamide-based resin is used as the base material (X), the heat treatment temperature is preferably 270 ° C. or lower. Moreover, when using the thermoplastic resin film which consists of polyester resins as a base material (X), it is preferable that the temperature of heat processing is 240 degrees C or less. The heat treatment can be performed in air, in a nitrogen atmosphere, or in an argon atmosphere.

  The heat treatment time is preferably in the range of 0.1 second to 1 hour, more preferably in the range of 1 second to 15 minutes, and still more preferably in the range of 5 to 300 seconds.

  The method of the present invention for producing a multilayer structure may include the step of irradiating the precursor layer of layer (Y) or layer (Y) with ultraviolet light. For example, the ultraviolet irradiation may be performed after the step [II] (for example, after the removal of the solvent of the coated first coating liquid (U) is almost completed).

  In order to dispose the adhesive layer (H) between the base material (X) and the layer (Y), the surface of the base material (X) is attached to a known anchor before applying the first coating liquid (U). You may process with a coating agent and may apply a well-known adhesive agent to the surface of base material (X).

  The method for producing a multilayer structure of the present invention may further include steps [i] and [ii]. In process [i], the 2nd coating liquid (V) containing the polymer (G1) containing a phosphorus atom and a solvent is prepared. In the step [ii], the layer (W) disposed adjacent to the layer (Y) is formed using the second coating liquid (V). The order of the step [i] is not particularly limited and may be performed in parallel with the step [I], [II] or [III], or may be performed after the step [I], [II] or [III]. Good. Step [ii] can be performed after step [II] or [III]. By applying the second coating liquid (V) to the layer (Y) or the precursor layer of the layer (Y), the layer (W) laminated on the layer (Y) so as to be in contact with the layer (Y) is formed. it can. When forming the layer (W) containing a polymer (G2), the 2nd coating liquid (V) contains a polymer (G2). In the second coating liquid (V), the mass ratio of the polymer (G1) and the polymer (G2) is such that the polymer (G1): polymer (G2) is in the range of 15:85 to 100: 0. Is preferable, and it is more preferable that it is in the range of 15:85 to 99: 1. By using the 2nd coating liquid (V) of the said mass ratio, the layer (W) in which the mass ratio of a polymer (G1) and a polymer (G2) exists in the said range can be formed. The second coating liquid (V) can be prepared by dissolving the polymer (G1) (and the polymer (G2) as necessary) in a solvent.

  The solvent used in the second coating liquid (V) may be appropriately selected according to the type of polymer contained, but is preferably water, alcohols, or a mixed solvent thereof. As long as the dissolution of the polymer is not hindered, the solvent is ether such as tetrahydrofuran, dioxane, trioxane, dimethoxyethane; ketone such as acetone and methyl ethyl ketone; glycol such as ethylene glycol and propylene glycol; methyl cellosolve, ethyl cellosolve, and n-butyl cellosolve. Glycerin; acetonitrile; amides such as dimethylformamide; dimethyl sulfoxide; sulfolane and the like.

  The concentration of the solid content (polymer (G1) and the like) in the second coating liquid (V) is preferably in the range of 0.01 to 60% by mass from the viewpoint of storage stability and coating property of the solution, More preferably, it is in the range of 0.1 to 50% by mass, and further preferably in the range of 0.2 to 40% by mass. The solid content concentration can be determined by a method similar to the method described for the first coating liquid (U).

  Usually, in the step [ii], the solvent in the second coating liquid (V) is removed to form the layer (W). The method for removing the solvent of the second coating liquid (V) is not particularly limited, and a known drying method can be applied. Examples of the drying method include a hot air drying method, a hot roll contact method, an infrared heating method, and a microwave heating method. The drying temperature is preferably 0 to 15 ° C. or lower than the flow start temperature of the substrate (X). The drying temperature is preferably in the range of 70 to 200 ° C, more preferably in the range of 150 to 200 ° C. The removal of the solvent may be carried out under normal pressure or reduced pressure. Moreover, when implementing process [ii] between the above-mentioned process [II] and process [III], you may remove a solvent by the heat processing in process [III].

  You may form a layer (W) on both surfaces of a base material (X) through a layer (Y). In an example of that case, the first layer (W) is formed by applying the second coating liquid (V) to one surface and then removing the solvent. Next, the second coating liquid (V) is applied to the other surface, and then the solvent is removed to form the second layer (W). The composition of the second coating liquid (V) applied to each surface may be the same or different.

  The multilayer structure obtained through the heat treatment in the step [III] can be used as it is as the multilayer structure of the present invention. However, a laminate in which another member (for example, another layer) is further bonded or formed on the multilayer structure as described above may be used as the multilayer structure of the present invention. The member can be bonded by a known method.

[Extruded coat laminate]
The multilayer structure of the present invention is obtained by, for example, laminating the layer (Y) (and optionally the layer (W)) directly or via the adhesive layer (H) on the substrate (X), By forming the layer directly or via the adhesive layer (H) by the extrusion coat lamination method, it is possible to further have a layer formed by extrusion coat lamination. There is no particular limitation on the extrusion coat laminating method that can be used in the present invention, and a known method may be used. In a typical extrusion coat laminating method, a laminated film is produced by sending a molten thermoplastic resin to a T-die and cooling the thermoplastic resin taken out from the flat slit of the T-die.

  An example of the most common single laminating method among the extrusion coat laminating methods will be described below with reference to the drawings. An example of the apparatus used for the single laminating method is shown in FIG. FIG. 10 schematically shows only the main part of the apparatus, which is different from the actual apparatus. The apparatus 50 of FIG. 10 includes an extruder 51, a T die 52, a cooling roll 53, and a rubber roll 54. The cooling roll 53 and the rubber roll 54 are disposed with their roll surfaces in contact with each other.

  The thermoplastic resin is heated and melted in an extruder and is extruded from the flat slit of the T die 52 to become a resin film 502. This resin film 502 becomes a layer containing a thermoplastic resin. On the other hand, a laminated body 501 is fed from a sheet feeding device (not shown) and is sandwiched between the cooling roll 53 and the rubber roll 54 together with the resin film 502. A laminated film (multilayer structure) in which the laminated body 501 and the resin film 502 are integrated by sandwiching the laminated body 501 and the resin film 502 between the cooling roll 53 and the rubber roll 54. 503 is manufactured.

  Examples of the extrusion coat laminating method other than the single laminating method include a sandwich laminating method and a tandem laminating method. The sandwich lamination method is a method in which a molten thermoplastic resin is extruded onto one base material, and a second base material is supplied from another unwinder (unwinding machine) and bonded. The tandem laminating method is a method in which two single laminating machines are connected to produce a laminate having a five-layer structure at a time.

  By using the laminate described above, a multilayer structure that maintains high barrier performance even after extrusion coating lamination can be obtained.

[Adhesive layer (H)]
In the multilayer structure of the present invention, the layer (Y) may be laminated so as to be in direct contact with the substrate (X). Moreover, the layer (Y) may be laminated | stacked on the base material (X) through the other layer. For example, the layer (Y) may be laminated on the substrate (X) via the adhesive layer (H). According to this structure, the adhesiveness of a base material (X) and a layer (Y) may be able to be improved. The adhesive layer (H) may be formed of an adhesive resin. The adhesive layer (H) made of an adhesive resin can be formed by treating the surface of the base material (X) with a known anchor coating agent or applying a known adhesive to the surface of the base material (X). . As the adhesive, a two-component reactive polyurethane adhesive in which a polyisocyanate component and a polyol component are mixed and reacted is preferable. Moreover, adhesiveness can be further improved by adding a small amount of additives such as a known silane coupling agent to the anchor coating agent or adhesive. Examples of the silane coupling agent include, but are not limited to, a silane coupling agent having a reactive group such as an isocyanate group, an epoxy group, an amino group, a ureido group, or a mercapto group. When the substrate (X) and the layer (Y) are strongly bonded via the adhesive layer (H), when the multilayer structure of the present invention is subjected to processing such as printing or laminating, barrier properties and appearance Can be more effectively suppressed, and the drop strength of the packaging material using the multilayer structure of the present invention can be increased. The thickness of the adhesive layer (H) is preferably 0.01 to 10.0 μm, and more preferably 0.03 to 5.0 μm.

[Other layers]
The multilayer structure of the present invention may include other layers for imparting various properties, for example, heat sealability, and improving barrier properties and mechanical properties. Such a multilayer structure of the present invention is obtained, for example, by laminating the layer (Y) directly on the base material (X) or via the adhesive layer (H), and then further directly or further bonding the other layer to the adhesive layer ( It can be produced by bonding or forming via H). Examples of other layers include, but are not limited to, an ink layer and a polyolefin layer.

  The multilayer structure of the present invention may include an ink layer for printing a trade name or a picture. Such a multilayer structure of the present invention is produced, for example, by directly forming the ink layer after laminating the layer (Y) directly on the substrate (X) or via the adhesive layer (H). it can. Examples of the ink layer include a film obtained by drying a liquid obtained by dispersing a polyurethane resin containing a pigment (for example, titanium dioxide) in a solvent, but an ink mainly containing a polyurethane resin not containing a pigment or other resins. A dried film may be used. As a method of applying the ink layer to the layer (Y), various coating methods such as a wire bar, a spin coater, a die coater, etc. can be used in addition to the gravure printing method. The thickness of the ink layer is preferably 0.5 to 10.0 μm, more preferably 1.0 to 4.0 μm.

  In the multilayer structure of the present invention, when the polymer (G2) is contained in the layer (W), it has a functional group having a high affinity with the adhesive layer (H) and other layers (for example, an ink layer). Adhesion between the layer (W) and other layers is improved. For this reason, barrier performance can be maintained after receiving physical stress such as stretching treatment, and appearance defects such as delamination can be suppressed.

  By using the polyolefin layer as the outermost surface layer of the multilayer structure of the present invention, heat sealability can be imparted to the multilayer structure, or the mechanical properties of the multilayer structure can be improved. From the viewpoint of improving heat sealability and mechanical properties, the polyolefin is preferably polypropylene or polyethylene. In order to improve the mechanical properties of the multilayer structure, it is preferable to laminate at least one film selected from the group consisting of a film made of polyester, a film made of polyamide, and a film made of a hydroxyl group-containing polymer. From the viewpoint of improving mechanical properties, the polyester is preferably polyethylene terephthalate, the polyamide is preferably nylon-6, and the hydroxyl group-containing polymer is preferably an ethylene-vinyl alcohol copolymer. In addition, you may provide the layer which consists of an anchor coat layer and an adhesive agent between each layer as needed.

[Configuration of multilayer structure]
Specific examples of the structure of the multilayer structure of the present invention are shown below. The multilayer structure may have an adhesive layer such as an adhesive layer (H), but the description of the adhesive layer and other layers is omitted in the following specific examples.
(1) Layer (Y) / Polyester layer,
(2) Layer (Y) / Polyester layer / Layer (Y),
(3) layer (Y) / polyamide layer,
(4) Layer (Y) / Polyamide layer / Layer (Y),
(5) Layer (Y) / Polyolefin layer,
(6) Layer (Y) / Polyolefin layer / Layer (Y),
(7) Layer (Y) / Hydroxyl-containing polymer layer,
(8) Layer (Y) / Hydroxyl-containing polymer layer / Layer (Y),
(9) Layer (Y) / Paper layer,
(10) Layer (Y) / Paper layer / Layer (Y),
(11) layer (Y) / inorganic vapor deposition layer / polyester layer,
(12) Layer (Y) / Inorganic vapor deposition layer / Polyamide layer,
(13) Layer (Y) / Inorganic vapor deposition layer / Polyolefin layer,
(14) layer (Y) / inorganic vapor deposition layer / hydroxyl group-containing polymer layer,
(15) Layer (Y) / Polyester layer / Polyamide layer / Polyolefin layer,
(16) Layer (Y) / Polyester layer / Layer (Y) / Polyamide layer / Polyolefin layer,
(17) Polyester layer / layer (Y) / polyamide layer / polyolefin layer,
(18) layer (Y) / polyamide layer / polyester layer / polyolefin layer,
(19) layer (Y) / polyamide layer / layer (Y) / polyester layer / polyolefin layer,
(20) Polyamide layer / layer (Y) / polyester layer / polyolefin layer,
(21) Layer (Y) / Polyolefin layer / Polyamide layer / Polyolefin layer,
(22) Layer (Y) / Polyolefin layer / Layer (Y) / Polyamide layer / Polyolefin layer,
(23) Polyolefin layer / layer (Y) / polyamide layer / polyolefin layer,
(24) Layer (Y) / Polyolefin layer / Polyolefin layer,
(25) Layer (Y) / Polyolefin layer / Layer (Y) / Polyolefin layer,
(26) Polyolefin layer / layer (Y) / polyolefin layer,
(27) Layer (Y) / Polyester layer / Polyolefin layer,
(28) Layer (Y) / Polyester layer / Layer (Y) / Polyolefin layer,
(29) Polyester layer / layer (Y) / polyolefin layer,
(30) Layer (Y) / Polyamide layer / Polyolefin layer,
(31) layer (Y) / polyamide layer / layer (Y) / polyolefin layer,
(32) Polyamide layer / layer (Y) / polyolefin layer,
(33) layer (Y) / polyester layer / paper layer,
(34) layer (Y) / polyamide layer / paper layer,
(35) layer (Y) / polyolefin layer / paper layer,
(36) Polyolefin layer / paper layer / polyolefin layer / layer (Y) / polyester layer / polyolefin layer,
(37) Polyolefin layer / paper layer / polyolefin layer / layer (Y) / polyamide layer / polyolefin layer,
(38) Polyolefin layer / paper layer / polyolefin layer / layer (Y) / polyolefin layer,
(39) Paper layer / Polyolefin layer / Layer (Y) / Polyester layer / Polyolefin layer,
(40) Polyolefin layer / paper layer / layer (Y) / polyolefin layer,
(41) Paper layer / Layer (Y) / Polyester layer / Polyolefin layer,
(42) Paper layer / layer (Y) / polyolefin layer,
(43) layer (Y) / paper layer / polyolefin layer,
(44) layer (Y) / polyester layer / paper layer / polyolefin layer,
(45) Polyolefin layer / paper layer / polyolefin layer / layer (Y) / polyolefin layer / hydroxyl group-containing polymer layer,
(46) Polyolefin layer / paper layer / polyolefin layer / layer (Y) / polyolefin layer / polyamide layer,
(47) Polyolefin layer / paper layer / polyolefin layer / layer (Y) / polyolefin layer / polyester layer,
(48) Inorganic vapor deposition layer / layer (Y) / polyester layer,
(49) Inorganic vapor deposition layer / layer (Y) / polyester layer / layer (Y) / inorganic vapor deposition layer,
(50) Inorganic vapor deposition layer / layer (Y) / polyamide layer,
(51) Inorganic vapor deposition layer / layer (Y) / polyamide layer / layer (Y) / inorganic vapor deposition layer,
(52) Inorganic vapor deposition layer / layer (Y) / polyolefin layer,
(53) Inorganic vapor deposition layer / layer (Y) / polyolefin layer / layer (Y) / inorganic vapor deposition layer

[Usage]
The multilayer structure of the present invention is excellent in both gas barrier properties and water vapor barrier properties, and is caused by a difference in thermal shrinkage between the substrate (X) and the layer (Y) that occurs during stretching during processing, heat sealing or retorting. Both barrier properties can be maintained at a high level even after receiving physical stress such as bending.

  The packaging material by preferable embodiment of this invention has the barrier property with respect to inorganic gas (for example, hydrogen gas, helium gas, nitrogen gas), natural gas, and an organic compound (for example, gasoline vapor | steam).

  Further, the packaging material including the multilayer structure of the present invention may be used after being secondarily processed into various molded products. Molded articles composed of such multilayer structures are: vertical bag filling and sealing bags, vacuum packaging bags, pouches, laminated tube containers, infusion bags, paper containers, strip tapes, container lids, in-mold label containers, or vacuum It may be a heat insulator. In these molded articles, heat sealing may be performed.

[Vertical bag filling and sealing bag]
The multilayer structure of the present invention may be a vertical bag-filling seal bag. An example is shown in FIG. 1 is formed by sealing a multilayer structure 11 on three sides of two end portions 11a and a body portion 11b. The vertical bag filling and sealing bag 10 can be manufactured by a vertical bag making and filling machine. Various methods are applied to bag making by a vertical bag making and filling machine. In either method, the contents are supplied from the upper opening of the bag to the inside, and then the opening is sealed. A vertical bag filling and sealing bag is manufactured. The vertical bag-filling-seal bag is composed of, for example, a single film material that is heat-sealed on three sides, the upper end, the lower end, and the side. The vertical bag-filling and sealing bag as a packaging container according to the present invention is excellent in gas barrier property and water vapor barrier property, and has gas barrier property and water vapor barrier property even after being subjected to physical stress such as bending treatment, deformation and impact with stretching. The decrease is small. Therefore, according to the vertical bag-filling seal bag, the quality deterioration of the contents can be suppressed over a long period of time.

[Vacuum packaging bag]
The packaging material including the multilayer structure of the present invention may be a vacuum packaging bag. An example is shown in FIG. The vacuum packaging bag 101 of FIG. 2 is a container that includes film materials 131 and 132 as wall members and is joined (sealed) to each other at the peripheral edge 111. The inside of the sealed vacuum packaging bag is depressurized. Usually, the film materials 131 and 132 are deformed in the central portion 112 surrounded by the peripheral edge portion 111 so as to be in close contact with the contents 150, and the inside and outside of the bag 101. Functions as a partition wall. The vacuum packaging bag can be manufactured using a nozzle type or chamber type vacuum packaging machine. The vacuum packaging bag as a packaging container according to the present invention has excellent gas barrier properties and water vapor barrier properties, and is suitable for maintaining gas barrier properties and water vapor barrier properties even after being subjected to physical stress such as bending treatment, deformation or impact with stretching. ing. Therefore, the barrier performance of the vacuum packaging bag hardly decreases over a long period of time.

[Pouch]
The packaging material including the multilayer structure of the present invention may be a pouch. An example is shown in FIG. The flat pouch 20 of FIG. 3 is formed by joining two multilayer structures 11 to each other at the peripheral edge portion 11c. In this specification, the phrase “pouch” means a container having a film material as a wall member mainly containing food, daily necessities or pharmaceuticals. Examples of the pouch include a pouch with a spout, a pouch with a chuck seal, a flat pouch, a stand-up pouch, a horizontal bag-filling seal pouch, and a retort pouch, depending on the shape and application. The pouch may be formed by laminating a barrier multilayer film and at least one other layer. The pouch as a packaging container according to the present invention is excellent in gas barrier property and water vapor barrier property, and maintains its gas barrier property and water vapor barrier property even when subjected to physical stress such as deformation or impact. Therefore, the pouch can prevent the contents from being deteriorated even after transportation or after long-term storage. In addition, since an example of the pouch can maintain good transparency, it is easy to check the contents and the deterioration of the contents due to deterioration.

[Laminated tube]
The packaging material including the multilayer structure of the present invention may be a laminated tube container. An example is shown in FIG. The laminate tube container 301 in FIG. 4 includes a body portion 331 including a laminate film 310 as a partition wall 320 that separates the inside and the outside of the container, and a shoulder portion 332, and the shoulder portion 332 has a through hole (extraction port). It has a cylindrical take-out portion 342 and a base portion 341 having a hollow truncated cone shape. More specifically, the laminated tube container includes a body portion 331 that is a cylindrical body with one end closed, a shoulder portion 332 disposed at the other end of the body portion 331, and an end seal portion 311. And a side seal portion 312, the shoulder portion 332 has a through hole (extraction port), a cylindrical extraction portion 342 having a male screw portion on the outer peripheral surface, and a base portion having a hollow truncated cone shape 341. A lid having a female screw portion corresponding to the male screw portion may be detachably attached to the take-out portion 342. The laminate film 310 constituting the wall member of the body portion 331 preferably has the flexibility of the degree described above for the film material. A molded body made of metal, resin, or the like can be used for the shoulder portion 332. The laminated tube container as a packaging container according to the present invention is excellent in gas barrier property and water vapor barrier property, and the decrease in gas barrier property and water vapor barrier property is small even after being subjected to physical stress such as bending treatment with deformation, deformation or impact. The gas barrier property and water vapor barrier property are excellent even after being squeezed during use. Moreover, in the laminated tube container using the multilayer structure excellent in transparency, it is easy to confirm the contents and confirm the deterioration of the contents due to deterioration.

[Infusion bag]
The packaging material including the multilayer structure of the present invention may be an infusion bag. The infusion bag is a container having an infusion preparation as its contents, and includes a film material as a partition that separates the inside and the outside for containing the infusion preparation. An example is shown in FIG. As shown in FIG. 5, the infusion bag may include a plug member 432 at the peripheral edge 412 of the bag body 431 in addition to the bag body 431 that stores the contents. The plug member 432 functions as a path for taking out the infusion contained in the bag body 431. Moreover, in order to suspend a bag, the infusion bag may be provided with the suspension hole 433 in the peripheral part 411 on the opposite side of the peripheral part 412 to which the plug member 432 is attached. The bag body 431 is formed by joining two film materials 410a and 410b to each other at the peripheral edge portions 411, 412, 413, and 414. The film materials 410 a and 410 b function as a partition wall 420 that separates the inside of the bag from the outside of the bag at the center portion surrounded by the peripheral edge portions 411, 412, 413, and 414 of the bag body 431. The infusion bag as a packaging container according to the present invention is excellent in gas barrier properties and water vapor barrier properties, and is less deteriorated in gas barrier properties and water vapor barrier properties even after being subjected to physical stress such as bending treatment, deformation, and impact with stretching. Therefore, according to the infusion bag, it is possible to prevent the filled liquid medicine from being deteriorated before the heat sterilization treatment, during the heat sterilization treatment, after the heat sterilization treatment, after transportation, and after storage.

[Paper container]
The packaging material containing the multilayer structure of the present invention may be a paper container. A paper container is a container in which the partition which separates the inside which accommodates the content, and the exterior contains a paper layer. In a preferred example, at least a part of the partition wall includes a multilayer structure, and the multilayer structure includes a substrate (X) and a layer (Y). The paper layer may be included in the substrate (X). The paper container may be of a predetermined shape having a bottom such as a brick type or a gable top type. The paper container as a packaging container according to the present invention has little deterioration in gas barrier properties and water vapor barrier properties even when it is bent. Moreover, since the transparency of the layer (Y) is good, the paper container is preferably used for a windowed container. An example is shown in FIG. The paper container 510 has a window portion 511 on the side surface of the body portion. The paper layer is removed from the base material of the window portion of the windowed container, and the contents can be visually recognized through the window portion 511. Even in the window portion 511 from which the paper layer has been removed, the layer structure of the multilayer structure with improved gas barrier properties is maintained as it is. The paper container 510 of FIG. 6 can be formed by bending or bonding (sealing) a flat laminate. The paper container is also suitable for heating by a microwave oven.

[Strip tape]
When a paper container is manufactured by bonding (sealing) a layered laminate, a strip tape may be used for a seal portion of the laminate. The strip tape is a band-shaped member used for joining wall materials (laminates) constituting the partition walls of the paper container to each other. The paper container by this invention may be equipped with the strip tape in the bonding part to which a laminated body is joined. In this case, the strip tape may include a multilayer structure having the same layer configuration as the multilayer structure included in the partition of the paper container. In one example of a preferred strip tape, both outermost layers are polyolefin layers for heat sealing. This strip tape can suppress the characteristic fall in the bonding part where gas barrier property and water vapor barrier property are easy to fall. Therefore, this strip tape is useful also for the paper container which does not correspond to the packaging container by this invention.

[Container cover]
The packaging material including the multilayer structure of the present invention may be a container lid. The container lid member includes a film material that functions as a part of a partition wall that separates the inside of the container from the outside of the container. The container lid is a container (with a lid) that is combined with the container body so as to seal the opening of the container body by heat sealing or bonding (sealing) using an adhesive, etc., and has a sealed space inside. Container). The container lid is usually joined to the container main body at the peripheral edge thereof. In this case, the center part surrounded by the peripheral part faces the internal space of the container. The container body is, for example, a molded body having a cup shape, a tray shape, or other shapes. The container body includes a wall surface part, a flange part for sealing the container lid, and the like. The container lid as a packaging container according to the present invention has excellent gas barrier properties and water vapor barrier properties, and even after bending treatment with stretching, the deterioration of the gas barrier properties and water vapor barrier properties is small. It can be suppressed for a long time.

[In-mold label container]
The packaging material including the multilayer structure of the present invention may be an in-mold label container. The in-mold label container includes a container body and the multilayer label (multilayer structure) of the present invention disposed on the surface of the container body. The container body is formed by injecting molten resin into the mold. The shape of the container body is not particularly limited, and may be a cup shape, a bottle shape, or the like.

  An example of the method of the present invention for manufacturing a container includes a first step of placing a multilayer label of the present invention in a cavity between a female mold part and a male mold part, and injecting molten resin into the cavity Thus, a second step of simultaneously forming the container body and applying the multilayer label of the present invention to the container body is included. Except for using the multilayer label of the present invention, each step can be performed in a known manner.

  A cross-sectional view of an example of the container of the present invention is shown in FIG. 7 includes a cup-shaped container main body 370 and multilayer labels 361 to 363 attached to the surface of the container main body 370. The multilayer labels 361 to 363 are multilayer labels of the present invention. The container body 370 includes a flange portion 371, a body portion 372, and a bottom portion 373. The flange portion 371 has a convex portion 371a projecting up and down at the tip thereof. The multilayer label 361 is disposed so as to cover the outer surface of the bottom 373. In the center of the multilayer label 361, a through hole 361a for injecting resin at the time of in-mold label molding is formed. The multilayer label 362 is disposed so as to cover the outer surface of the body portion 372 and the lower surface of the flange portion 371. The multilayer label 363 is disposed so as to cover a part of the inner surface of the body portion 372 and the upper surface of the flange portion 371. The multilayer labels 361 to 363 are fused to the container main body 370 by an in-mold label forming method, and are integrated with the container main body 360. As shown in FIG. 7, the end surface of the multilayer label 363 is fused to the container body 360 and is not exposed to the outside.

[Vacuum insulation]
A vacuum heat insulating body is a heat insulating body provided with a coating material and a core material disposed inside the coating material, and the inside where the core material is disposed is decompressed. The vacuum insulator makes it possible to achieve a heat insulation characteristic equivalent to that of a heat insulator made of urethane foam with a thinner and lighter heat insulator. Since the vacuum heat insulating body of the present invention can maintain a heat insulating effect for a long period of time, it is used as a heat insulating material for household appliances such as a refrigerator, a hot water supply facility, and a rice cooker, a wall portion, a ceiling portion, an attic portion, a floor portion, and the like. It can be used for heat transfer devices such as heat insulating materials for automobiles, heat insulating panels for vehicle roofing materials, vending machines, and heat pump application equipment.

  An example of the vacuum insulator according to the present invention is shown in FIG. The vacuum heat insulating body 601 in FIG. 8 includes a covering material 610 and a particulate core material 651, and the covering material 610 includes two film materials 631 and 632 that are joined to each other at a peripheral edge 611. The material 651 is disposed inside the covering material 610. In the central portion surrounded by the peripheral edge portion 611, the covering material 610 functions as a partition wall that separates the inside and the outside where the core material 651 is accommodated, and is in close contact with the core material 651 due to a pressure difference between the inside and the outside. .

  Another example of the vacuum insulator according to the present invention is shown in FIG. The vacuum heat insulating body 602 has the same configuration as the vacuum heat insulating body 601 except that the vacuum heat insulating body 602 includes a core material 652 formed integrally instead of the core material 651. The core member 652 is typically a resin foam.

  The material and shape of the core material are not particularly limited as long as they are suitable for heat insulation. Examples of the core material include pearlite powder, silica powder, precipitated silica powder, diatomaceous earth, calcium silicate, glass wool, rock wool, artificial (synthetic) wool, resin foam (eg, styrene foam, urethane foam), and the like. Can be mentioned. As the core material, a hollow container, a honeycomb structure or the like molded into a predetermined shape can also be used.

  The present invention includes embodiments in which the above-described configurations are variously combined within the technical scope of the present invention as long as the effects of the present invention are exhibited.

  EXAMPLES Next, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to these examples at all, and many variations are within the technical idea of the present invention. This is possible by those with ordinary knowledge. Analysis and evaluation in the following examples and comparative examples were performed as follows.

(1) Infrared absorption spectrum of layer (Y) Measurement was performed by the attenuated total reflection method using a Fourier transform infrared spectrophotometer. The measurement conditions were as follows.
Device: Spectrum One manufactured by PerkinElmer Co., Ltd.
Measurement mode: attenuated total reflection method Measurement region: 800 to 1,400 cm ⁻¹

(2) Measurement of thickness of each layer The multilayer structure was cut using a focused ion beam (FIB) to prepare a section (thickness 0.3 μm) for cross-sectional observation. The prepared section was fixed to the sample base with carbon tape, and platinum ion sputtering was performed at an acceleration voltage of 30 kV for 30 seconds. The cross section of the multilayer structure was observed using a field emission transmission electron microscope, and the thickness of each layer was calculated. The measurement conditions were as follows.
Apparatus: JEM-2100F manufactured by JEOL Ltd.
Accelerating voltage: 200kV
Magnification: 250,000 times

(3) Determination of metal ions Add 5 mL of analytical grade high-purity nitric acid to 1.0 g of the multilayer structure, perform microwave decomposition treatment, and adjust the volume of the resulting solution to 50 mL with ultrapure water. A solution for quantitative analysis of other metal ions was obtained. Moreover, the solution for quantitative analysis of aluminum ions was obtained by measuring 0.5 mL of this solution to 50 mL with ultrapure water. The amount of metal ions contained in the solution obtained by the above method was quantified by an internal standard method using an inductively coupled plasma emission spectrometer. The lower limit of detection of each metal ion was 0.1 ppm. The measurement conditions were as follows.
Device: Optima 4300 DV manufactured by Perkin Elmer Co., Ltd.
RF power: 1,300W
Pump flow rate: 1.50 mL / min Auxiliary gas flow rate (argon): 0.20 L / min Carrier gas flow rate (argon): 0.70 L / min Coolant gas: 15.0 L / min

(4) Quantification of ammonium ion The multilayer structure was cut into a size of 1 cm × 1 cm and freeze-ground. The obtained powder was sieved with a sieve having a nominal size of 1 mm (conforming to standard sieve standard JIS-Z8801-3). 10 g of the powder that passed through the sieve was dispersed in 50 mL of ion-exchanged water, and an extraction operation was performed at 95 ° C. for 10 hours. Ammonium ions contained in the obtained extract were quantified using a cation chromatography apparatus. The lower limit of detection was 0.02 ppb. The measurement conditions were as follows.
Apparatus: ICS-1600 manufactured by Dionex
Guard column: IonPAC CG-16 (5φ × 50 mm) manufactured by Dionex
Separation column: Dionex IonPAC CS-16 (5φ × 250 mm)
Detector: Electrical conductivity detector Eluent: 30 mmol / L Methanesulfonic acid aqueous solution Temperature: 40 ° C
Eluent flow rate: 1 mL / min Analytical volume: 25 μL

(5) Measurement of oxygen permeability A sample was attached to an oxygen permeation amount measuring device so that the layer of the base material faces the carrier gas side, and the oxygen permeability was measured by the isobaric method. The measurement conditions were as follows.
Equipment: MOCON OX-TRAN 2/20 manufactured by Modern Control
Temperature: 20 ° C
Oxygen supply side humidity: 85% RH
Humidity on the carrier gas side: 85% RH
Oxygen pressure: 1 atm Carrier gas pressure: 1 atm

(6) Measurement of water vapor permeability (isobaric method)
A sample was attached to the water vapor transmission amount measuring apparatus so that the layer of the base material faces the carrier gas side, and moisture permeability (water vapor transmission rate) was measured by an isobaric method. The measurement conditions were as follows.
Equipment: MOCON PERMATRAN W3 / 33 manufactured by Modern Control
Temperature: 40 ° C
Humidity on the water vapor supply side: 90% RH
Humidity on the carrier gas side: 0% RH

(7) Measurement of water vapor transmission rate (differential pressure method) (Examples 1-36 to 1-39; measurement of moisture permeability of Comparative Example 1-7)
A sample was attached to the water vapor transmission amount measuring device so that the layer of the base material faces the water vapor supply side, and the water vapor transmission rate (water vapor transmission rate) was measured by a differential pressure method. The measurement conditions were as follows.
Apparatus: Deltaperm manufactured by Technolox
Temperature: 40 ° C
Water pressure (upper chamber) pressure: 50 Torr (6,665 Pa)
Water vapor permeation (lower chamber) side pressure: 0.003 Torr (0.4 Pa)

<Synthesis Example of Polymer (G1-1)>
Under a nitrogen atmosphere, 8.5 g of 2-phosphonooxyethyl methacrylate and 0.1 g of azobisisobutyronitrile were dissolved in 17 g of methyl ethyl ketone and stirred at 80 ° C. for 12 hours. After the obtained polymer solution was cooled, it was added to 170 g of 1,2-dichloroethane, and the polymer was recovered as a precipitate by decantation. Subsequently, the polymer was dissolved in tetrahydrofuran, and reprecipitation purification was performed using 1,2-dichloroethane as a poor solvent. After performing reprecipitation purification 3 times, the polymer (G1-1) was obtained by vacuum-drying at 50 degreeC for 24 hours. The polymer (G1-1) is a polymer of 2-phosphonooxyethyl methacrylate. As a result of GPC analysis, the number average molecular weight of the polymer was 10,000 in terms of polystyrene.

<Synthesis Example of Polymer (G1-2)>
Under a nitrogen atmosphere, 10 g of vinylphosphonic acid and 0.025 g of 2,2′-azobis (2-amidinopropane) dihydrochloride were dissolved in 5 g of water and stirred at 80 ° C. for 3 hours. After cooling, the polymerization solution was diluted by adding 15 g of water, and filtered using “Spectra / Por” (registered trademark) manufactured by Spectrum Laboratories, which is a cellulose membrane. After water in the filtrate was distilled off, the polymer (G1-2) was obtained by vacuum drying at 50 ° C. for 24 hours. The polymer (G1-2) is poly (vinyl phosphonic acid). As a result of GPC analysis, the number average molecular weight of the polymer was 10,000 in terms of polyethylene glycol.

<Example of production of first coating liquid (U-1)>
The temperature was raised to 70 ° C. while stirring 230 parts by mass of distilled water. To the distilled water, 88 parts by mass of triisopropoxyaluminum was added dropwise over 1 hour, the liquid temperature was gradually raised to 95 ° C., and the generated isopropanol was distilled off to carry out hydrolysis and condensation. To the obtained liquid, 4.0 parts by mass of a 60% by mass aqueous nitric acid solution was added and stirred at 95 ° C. for 3 hours to flocculate the aggregates of hydrolyzed condensate particles. Thereafter, 2.24 parts by mass of an aqueous sodium hydroxide solution having a concentration of 1.0 mol% was added to the liquid, and the solid content concentration was concentrated to 10% by mass in terms of aluminum oxide. With respect to 18.66 parts by mass of the liquid thus obtained, 58.19 parts by mass of distilled water, 19.00 parts by mass of methanol, and a 5% by mass aqueous polyvinyl alcohol solution (PVA124 manufactured by Kuraray Co., Ltd .; degree of saponification 98.5) (Mole%, viscosity average degree of polymerization 2,400, 4 mass% aqueous solution viscosity at 20 ° C. 60 mPa · s) 0.50 part by mass is added and stirred uniformly to obtain a liquid containing the metal oxide (A). A dispersion was obtained. Subsequently, 3.66 parts by mass of 85 mass% phosphoric acid aqueous solution, which is a solution containing the phosphorus compound (B), was added dropwise while stirring the dispersion while maintaining the liquid temperature at 15 ° C., and the addition was completed. Stirring was continued for another 30 minutes later _, and the target first coating solution having the values of N _M / N _P, F _Z × N _Z / N _M, and F _Z × N _Z / N _P listed in Table 1 ( U-1) was obtained.

<Example of production of first coating liquids (U-2) to (U-5)>
In the preparation of the first coating liquids (U-2) to (U-5), the values of F _Z × N _Z / N _M and F _Z × N _Z / N _P in the preparation of the dispersion liquid are shown in Table 1 below. The amount of the 1.0 mol% sodium hydroxide aqueous solution added was changed so that the value shown in FIG. Except for this, the first coating liquids (U-2) to (U-5) were prepared by the same method as the preparation of the first coating liquid (U-1).

<Example of production of first coating liquid (U-6)>
In the preparation of the first coating liquid (U-6), the aqueous sodium hydroxide solution was not added in the preparation of the dispersion, and the amount of distilled water added was 58.09 parts by mass. Moreover, after adding phosphoric acid aqueous solution to a dispersion liquid, 0.10 mass part of 1.0 mol% sodium hydroxide aqueous solution was added. Except for these, the first coating liquid (U-6) was prepared by the same method as the preparation of the first coating liquid (U-1).

<Example of production of first coating liquid (U-8)>
The first coating solution was prepared in the same manner as the preparation of the first coating solution (U-5) except that trimethyl phosphate was used instead of phosphoric acid as the phosphorus compound (B) in the solution containing the phosphorus compound (B). (U-8) was prepared.

<Example of production of first coating liquid (U-9)>
In the preparation of the dispersion, the first coating was carried out in the same manner as the preparation of the first coating liquid (U-5) except that a 5% by mass polyacrylic acid aqueous solution was used instead of the 5% by mass polyvinyl alcohol aqueous solution. A liquid (U-9) was prepared.

<Examples of production of first coating liquids (U-7) and (U-10) to (U-18)>
The first coating liquid (U-5) was prepared in the same manner as the first coating liquid (U-5) except that an aqueous solution of various metal salts was used instead of the 1.0 mol% aqueous sodium hydroxide solution in the preparation of the dispersion. U-7) and (U-10) to (U-18) were prepared. As an aqueous solution of the metal salt, a 1.0 mol% sodium chloride aqueous solution is used in the first coating solution (U-7), and a 1.0 mol% lithium hydroxide aqueous solution is used in the first coating solution (U-10). The liquid (U-11) is 1.0 mol% potassium hydroxide aqueous solution, the first coating liquid (U-12) is 0.5 mol% calcium chloride aqueous solution, and the first coating liquid (U-13) is 0.00. 5 mol% cobalt chloride aqueous solution, 0.5 mol% zinc chloride aqueous solution in the first coating solution (U-14), 0.5 mol% magnesium chloride aqueous solution in the first coating solution (U-15), In the coating liquid (U-16), 1.0 mol% aqueous ammonia solution, and in the first coating liquid (U-17), salt aqueous solution (1.0 mol% sodium chloride aqueous solution and 0.5 mol% salt). Mixed solution of aqueous solution of calcium), was used first coating liquid (U-18) In a mixed solution of zinc chloride solution of a salt solution (0.5 mol% and 0.5 mol% aqueous solution of calcium chloride).

<Example of production of first coating liquids (U-19) to (U-23)>
The first coating liquid (U-5) was prepared in the same manner as the preparation of the first coating liquid (U-5) except that the ratios of N _M / N _P and F _Z × N _Z / N _P were changed according to Table 1 described later. U-19) to (U-23) were prepared.

<Example of production of first coating liquids (U-34) and (U-35)>
In the preparation of the first coating liquids (U-34) and (U-35), the values of F _Z × N _Z / N _M and F _Z × N _Z / N _P in the preparation of the dispersion liquid are shown in Table 9 below. The addition amounts of 1.0 mol% sodium hydroxide aqueous solution and 1.0 mol% potassium hydroxide aqueous solution were changed so that the values shown in FIG. Except this, the 1st coating liquid (U-34) and (U-35) were prepared by the method similar to preparation of the 1st coating liquid (U-1).

<Example of production of first coating liquids (U-36) to (U-38)>
In the preparation of the dispersion liquid, 0.015 parts by mass of lanthanum oxide is used for the first coating liquid (U-36), 0.006 parts by mass of boric acid is used for the first coating liquid (U-37), and the first coating liquid (U In -38), 0.007 parts by mass of zinc oxide was used in place of the aqueous sodium hydroxide solution. All of these were added after the polyvinyl alcohol aqueous solution was added. Moreover, 58.19 mass parts of distilled water added by preparation of a 1st coating liquid (U-1) are 58.17 mass parts in 1st coating liquid (U-36), 1st coating liquid (U-). In 37) and (U-38), it was 58.18 parts by mass. Except for these changes, first coating solutions (U-36) to (U-38) were prepared by the same method as the preparation of the first coating solution (U-1).

<Examples of production of first coating liquids (U-39) and (U-40)>
In the preparation of the first coating liquids (U-39) and (U-40), the first coating liquids (U-39), (U- 40) The first coating liquid (U-34) and (U-35) were prepared in the same manner as in the preparation of the first coating liquids (U-34) and (U-35) except that the amount of distilled water added to 58.57 parts by mass was changed. -39) and (U-40) were prepared.

<Example of production of first coating liquids (U-41) to (U-43)>
In the preparation of the first coating liquids (U-41) to (U-43), in the preparation of the dispersion liquid, a 5% by weight polyvinyl alcohol aqueous solution is not added, but is added to the first coating liquid (U-41). The amount of water was 58.56 parts by mass, and the amount of distilled water added to the first coating liquids (U-42) and (U-43) was 58.57 parts by mass. Except for these changes, first coating solutions (U-41) to (U-43) were prepared by the same method as the preparation of the first coating solutions (U-36) to (U-38).

<Example of production of first coating liquid (CU-1)>
The first coating liquid (CU-1) was prepared in the same manner as the preparation of the first coating liquid (U-1) except that 1.0 mol% aqueous sodium hydroxide solution was not added in the preparation of the dispersion. Prepared.

<Examples of production of first coating liquids (CU-2) and (CU-6)>
In the preparation of the dispersion liquid, the first coating liquid (except that the addition amount of 1.0 mol% sodium hydroxide aqueous solution was changed so that the value of F _Z × N _Z / N _M would be the value shown in Table 1) First coating liquids (CU-2) and (CU-6) were prepared by a method similar to the preparation of U-1).

<Example of production of first coating liquid (CU-8)>
The same method as the preparation of the first coating liquid (U-1) except that the 5% by weight polyvinyl alcohol aqueous solution was not added in the preparation of the dispersion and the amount of distilled water to be added was changed to 58.57 parts by mass. Thus, a first coating liquid (CU-8) was prepared.

<First coating liquid (CU-3) and (CU-4) of Preparation Example> N _M / N _P first coating liquid is a value except for changing in accordance with Table 1 a similar to the preparation of (U-5) First coating liquids (CU-3) and (CU-4) were prepared by the method.

<Example of production of first coating liquid (CU-5)>
In the preparation of the dispersion, 0.38 parts by mass of tetraethoxysilane was used in place of the aqueous sodium hydroxide solution. This was added after adding the polyvinyl alcohol aqueous solution. Moreover, 58.19 mass parts of distilled water added by preparation of the 1st coating liquid (U-1) was 57.88 mass parts in the 1st coating liquid (CU-5). Except for these changes, a first coating solution (CU-5) was prepared by the same method as the preparation of the first coating solution (U-1).

<Example of production of second coating liquids (V-1) to (V-6)>
First, the polymer (G1-1) obtained in Synthesis Example 1 was dissolved in a mixed solvent of water and methanol (water: methanol = 7: 3 by mass ratio), and the second coating liquid having a solid content concentration of 1% by mass. (V-1) was obtained. In addition, 91% by mass of the polymer (G1-1) obtained in Synthesis Example 1 and polyvinyl alcohol (PVA124 manufactured by Kuraray Co., Ltd .; saponification degree 98.5 mol%, viscosity average polymerization degree 2,400, at 20 ° C. A mixture containing 9% by mass of a 4% by mass aqueous solution viscosity of 60 mPa · s) was prepared. This mixture was dissolved in a mixed solvent of water and methanol (water: methanol = 7: 3 in mass ratio) to obtain a second coating liquid (V-2) having a solid content concentration of 1% by mass. Further, a mixture containing 91% by mass of the polymer (G1-1) obtained in Synthesis Example 1 and 9% by mass of polyacrylic acid (number average molecular weight 210,000, weight average molecular weight 1,290,000) was prepared. This mixture was dissolved in a mixed solvent of water and methanol (water: methanol = 7: 3 by mass ratio) to obtain a second coating liquid (V-3) having a solid content concentration of 1% by mass. Furthermore, the second coating liquid (V-1) to (V-3) were prepared in the same manner as in the preparation of the second coating liquids (V-1) to (V-3) except that the polymer (G1-1) was changed to the polymer (G1-2). V-4) to (V-6) were obtained.

Details of the films used in the examples and comparative examples are as follows.
1) PET12: Stretched polyethylene terephthalate film; “Lumirror P60” (trade name) manufactured by Toray Industries, Inc.
2) ONY: stretched nylon film; manufactured by Unitika Ltd., “Emblem ONBC” (trade name), thickness 15 μm
3) CPP50: unstretched polypropylene film; “RXC-21” (trade name), 50 μm in thickness, manufactured by Mitsui Chemicals, Inc.
4) CPP60: unstretched polypropylene film; “RXC-21” (trade name), manufactured by Mitsui Chemicals, Inc., cello, thickness 60 μm
5) CPP70: unstretched polypropylene film; “RXC-21” (trade name), manufactured by Mitsui Chemicals Tosero Co., Ltd., thickness 70 μm
6) CPP100: unstretched polypropylene film; “RXC-21” (trade name), manufactured by Mitsui Chemicals, Inc., cello, thickness: 100 μm

[Example 1] Container <Example 1-1>
First, plasma treatment was applied to the surface of a PET bottle (volume 500 mL, surface area 0.041 m ² , weight 35 g) serving as a base material. The first coating liquid (U-1) was applied to the surface of this PET bottle by an immersion method, and then dried at 110 ° C. for 5 minutes. Next, heat treatment was performed at 120 ° C. for 5 minutes. Thus, the container (1-1) which has a structure of base material (X) / layer (Y) was obtained.

  A sample for measurement having a size of 15 cm (circumferential direction) × 10 cm (length direction) was cut out from the body of the container (1-1). With respect to this measurement sample, the oxygen permeability and moisture permeability before and after the stretching treatment were measured. In addition, the extending | stretching process was performed by hold | maintaining the state which extended | stretched the sample 5% in the circumferential direction for 10 second.

<Examples 1-2 to 1-23 and Comparative Examples 1-1 to 1-6>
Implemented except that instead of the first coating liquid (U-1), the first coating liquids (U-2) to (U-23) and the first coating liquids (CU-1) to (CU-6) were used. Containers (1-2) to (1-23) and (C1-1) to (C1-6) were prepared in the same manner as in the preparation of the container (1-1) of Example 1-1.

<Example 1-24>
Plasma treatment was performed on the surface of a PET bottle (volume 500 mL, surface area 0.041 m ² , weight 35 g). The first coating liquid (U-4) was applied to the surface of this PET bottle by an immersion method, and then dried at 110 ° C. for 5 minutes to obtain a structure. Then, the 2nd coating liquid (V-1) was applied to the surface of the structure obtained by the immersion method so that the thickness after drying might be 0.3 micrometer, and it dried for 5 minutes at 120 degreeC. Thus, the container (1-24) which has a structure of base material (X) / layer (Y) / layer (W) was obtained.

<Examples 1-25 to 1-29>
Except having used 2nd coating liquid (V-2)-(V-6) instead of 2nd coating liquid (V-1), it is the same as that of preparation of the container (1-24) of Example 1-24. Thus, containers (1-25) to (1-29) were produced.

<Example 1-30>
On the surface of a PET bottle (volume 500 mL, surface area 0.041 m ² , weight 35 g), an aluminum oxide vapor deposition layer (X ′) having a thickness of 0.03 μm was laminated by a vacuum vapor deposition method. A container (1-30) was produced in the same manner as in the production of the container (1-4) of Example 1-4, except that a PET bottle on which a vapor deposition layer was formed was used as a substrate.

<Example 1-31>
On the container (1-4) produced in Example 1-4, a container (1-31) was produced by forming a deposited layer (X ′) of aluminum oxide having a thickness of 0.03 μm by vacuum deposition. did.

Table 1 shows the conditions for forming the layer (Y) in Examples 1-1 to 1-31, the layer (CY) in Comparative Examples 1-1 to 1-6 corresponding to the layer (Y), and the layer (W). Street. The abbreviations in Table 1 represent the following substances.
PVA: polyvinyl alcohol (PVA124 manufactured by Kuraray Co., Ltd.)
PAA: polyacrylic acid (Aron-15H manufactured by Toa Gosei Co., Ltd.)
PPEM: Poly (2-phosphonooxyethyl methacrylate)
PVPA: Poly (vinyl phosphonic acid)

  The containers prepared in Examples and Comparative Examples were evaluated in the same manner as the container (1-1). Table 2 shows the configurations of the containers of Examples and Comparative Examples and the evaluation results of the containers.

  As shown in Table 2, the container of the present invention maintained the oxygen barrier property and the water vapor barrier property at a high level even under strong physical stress.

[Example 2] Vertical bag filling and sealing bag <Example 2-1>
First, PET12 is used as the base material (X), and the first coating liquid (U-1) is coated on the base material using a bar coater so that the thickness after drying is 0.5 μm. , And dried at 110 ° C. for 5 minutes. Furthermore, the multilayer structure (2-1-1) which has a structure of a base material (X) / layer (Y) was produced by heat-processing for 1 minute at 180 degreeC. A result of measuring the infrared absorption spectrum of the multilayer structure (2-1-1), the maximum absorption wave number in the region of 800～1,400Cm ^-1 is 1,107Cm ^-1, the half-value width of the maximum absorption band in the region Was 37 cm ⁻¹ .

  After forming an adhesive layer on the obtained multilayer structure (2-1-1), a laminate was obtained by laminating ONY on the adhesive layer. Next, an adhesive layer was formed on the ONY of the laminate, and then CPP70 was laminated on the adhesive layer and left to stand at 40 ° C. for 5 days for aging. Thus, the multilayer structure (2-1-2) which has a structure of base material (X) / layer (Y) / adhesion layer / ONY / adhesion layer / CPP was obtained. Each of the two adhesive layers was formed by applying a two-component adhesive using a bar coater so that the thickness after drying would be 3 μm and drying. Two-component adhesives include “Takelac” (registered trademark) “A-525S” (brand name) manufactured by Mitsui Chemicals, Inc. and “Takenate” (registered trademark) “A-25” manufactured by Mitsui Chemicals, Inc. A two-component reactive polyurethane adhesive composed of (brand) was used. The multilayer structure (2-1-2) was cut into a width of 400 mm, and supplied to a vertical bag making and packing machine (manufactured by ORIHIRO Co., Ltd.) so that the CPP layers were in contact with each other and heat sealed. A vertical bag making and filling packaging machine as shown in FIG. 1 produced a vertical bag filling and sealing bag (2-1) (width 160 mm, length 470 mm) as shown in FIG. A sample for measurement was cut out from the vertical bag-filling seal bag (2-1), and the oxygen permeability and moisture permeability before and after the stretching treatment were measured. In addition, the extending | stretching process was performed by hold | maintaining the state which extended | stretched the sample 5% in the longitudinal direction for 10 second.

  Ten vertical bag filling and sealing bags (2-1) were put in a cardboard box (15 × 35 × 45 cm). A cushioning material was packed in the gap between the vacuum packaging bag and the cardboard box. Then, a transport test was carried out in which cardboard boxes containing vertical bag-filled sealing bags (2-1) were stacked on a truck and reciprocated 10 times between Okayama Prefecture and Tokyo (distance about 700 km). A sample for measurement was cut out from the vertical bag-filled seal bag (2-1) after the transportation test and left for 24 hours under conditions of 23 ° C. and 50% RH, and then the oxygen permeability and moisture permeability of the sample were measured. did.

<Examples 2-2 to 2-23 and Comparative Examples 2-1 to 2-6>
Example 2-1 except that the first coating liquids (U-2) to (U-23) and (CU-1) to (CU-6) were used instead of the first coating liquid (U-1). The multilayer structures (2-2-1) to (2-23-1) and (C2-1-1) to (C2-6) are prepared in the same manner as in the production of the multilayer structure (2-1-1). 1) was produced.

<Example 2-24>
The first coating liquid (U-4) was applied onto PET 12 using a bar coater so that the thickness after drying was 0.5 μm, dried at 110 ° C. for 5 minutes, and then 1 at 160 ° C. Layer (Y) was formed by heat treatment for minutes. Next, the second coating liquid (V-1) was applied on the layer (Y) so that the thickness after drying was 0.3 μm, and dried at 200 ° C. for 1 minute. In this way, a multilayer structure (2-24-1) having a configuration of base material (X) / layer (Y) / layer (W) was produced.

<Examples 2-25 to 2-29>
The multilayer structure (2-24-1) of Example 2-24 was used except that the second coating liquids (V-2) to (V-6) were used instead of the second coating liquid (V-1). Multilayer structures (2-25-1) to (2-29-1) were produced in the same manner as in the production.

<Example 2-30>
On PET12 used as base material (X) in Example 2-1, an aluminum oxide vapor deposition layer (thickness: 0.03 μm) was formed by a vacuum vapor deposition method. Substrate (X) / deposition layer (X) in the same manner as the production of the multilayer structure (2-4-2) of Example 2-4 except that the obtained film was used instead of the substrate (X). A multilayer structure (2-30-1) having a configuration of ') / layer (Y) was produced.

<Example 2-31>
On the layer (Y) of the multilayer structure (2-4-2) obtained in Example 2-4, an aluminum oxide vapor deposition layer (thickness: 0.03 μm) was formed by a vacuum vapor deposition method to obtain a multilayer. A structure (23-11-1) was produced.

<Example 2-32>
An aluminum oxide vapor deposition layer (thickness: 0.03 μm) was formed on both surfaces of PET 12 used as the substrate (X) in Example 2-1 by a vacuum vapor deposition method. Next, the first coating liquid (U-4) was applied to each of the two vapor deposition layers so that the thickness after drying was 0.5 μm, dried at 110 ° C. for 5 minutes, and then 180 ° C. For 1 minute. In this way, a multilayer structure (2-23-1) was produced.

<Example 2-33>
The first coating solution (U-4) was applied to both surfaces of PET 12 used as the base material (X) in Example 2-1 so that the thickness after drying was 0.5 μm, and 5 ° C. at 110 ° C. After drying for 1 minute, heat treatment was performed at 180 ° C. for 1 minute. Thus, the layer (Y) was formed on both surfaces of the base material. Next, an aluminum oxide vapor deposition layer (thickness: 0.03 μm) was formed on each of the two layers (Y) by a vacuum vapor deposition method. In this way, a multilayer structure (23-3-1) was produced.

In place of the multilayer structure (2-1-1), multilayer structures (2-2-1) to (23-3-1) and (C2-1-1) to (C2-6-1) were used. Except for the above, in the same manner as in the production of the multilayer structure (2-1-2), the multilayer structures (2-2-2) to (2-33-2) and (C2-1-2) to (C2- 6-2) was produced. Furthermore, instead of the multilayer structure (2-1-2), multilayer structures (2-2-2) to (2-33-2) and (C2-1-2) to (C2-6-2) are used. The vertical bag filling and sealing bags (2-2) to (2-23) and (C2-1) to (C2-6) were prepared in the same manner as the production of the vertical bag filling and sealing bag (2-1) except that it was used. ) Was produced. The produced multilayer structure and vertical bag-filling seal bag were evaluated in the same manner as in Example 2-1. Table 3 shows the production conditions of the multilayer structures (2-1-1) to (23-3-1) and (C2-1-1) to (C2-6-1) and the maximum absorption wave number of the layer (Y). Show. In addition, Table 4 shows the evaluation results of the vertical bag-filling seal bag. Note that F _Z × N _Z / N _M in the layer (Y) of the multilayer structures (2-1-1) to (23-3-1) and (C2-1-1) to (C2-6-1). , N _M / N _P and F _Z × N _Z / N _P are the same coating agent (U-2) in Examples 1-1 to 1-31 and Comparative Examples 1-1 to 1-6. It is the same as the value of the layer (Y) that uses (U-23) and (CU-1) to (CU-6).

  As shown in Table 4, the vertical bag-filling-seal bag of the present invention maintained the oxygen barrier property and the water vapor barrier property at a high level even when subjected to strong physical stress.

[Example 3] Vacuum packaging bag <Example 3-1>
Two rectangular laminates of 22 cm × 30 cm were cut from the multilayer structure (2-1-2) produced in Example 2-1. Then, two multilayer structures (2-1-2) were overlaid so that the CPP layer was inside, and a bag was formed by heat-sealing the three sides of the rectangle. The bag was filled with wooden spheres (diameter 30 mm) as a solid food model in a state where they were spread in one layer so that the spheres were in contact with each other. Thereafter, the air inside the bag was evacuated, and the last side was heat-sealed to obtain a vacuum-packed bag (3-1) that was vacuum-packed in close contact along the irregularities of the sphere. A sample for measurement was cut out from the vacuum packaging bag (3-1), and the oxygen permeability and moisture permeability before and after the stretching treatment were measured. In addition, the extending | stretching process was performed by hold | maintaining the state which extended | stretched the sample 5% in the bag longitudinal direction for 10 second.

  50 vacuum packaging bags (3-1) were put in a cardboard box (15 × 35 × 45 cm). A cushioning material was packed in the gap between the vacuum packaging bag and the cardboard box. Then, a cardboard box containing the vacuum packaging bag (3-1) was loaded on a truck, and a transportation test was performed in which 10 reciprocations were made between Okayama Prefecture and Tokyo. A sample for measurement was cut out from the vacuum packaging bag (3-1) after the transportation test, and the oxygen permeability and moisture permeability of the sample were measured.

<Examples 3-2 to 3-33 and Comparative Examples 3-1 to 3-6>
Other than replacing multilayer structure (2-1-2) with multilayer structures (2-2-2) to (2-33-2) and (C2-1-2) to (C2-6-2) Are produced in the same manner as the production of the vacuum packaging bag (3-1) of Example 3-1, and the vacuum packaging bags (3-2) to (3-33) and (C3-1) to (C3-6) are produced. did. About the produced vacuum packaging bag, it evaluated similarly to a vacuum packaging bag (3-1). Table 5 shows the numbers and evaluation results of the multilayer structures used for the production of the vacuum packaging bags.

  As shown in Table 5, the vacuum packaging bag of the present invention maintained oxygen barrier properties and water vapor barrier properties at a high level even when subjected to strong physical stress.

[Example 4] Laminated tube container <Example 4-1>
An adhesive layer was formed on each of the two CPPs 100 and laminated with the multilayer structure (2-1-2) obtained in Example 2-1. In this way, a laminate film having a structure of CPP / adhesive layer / multilayer structure / adhesive layer / CPP was obtained. The adhesive layer was formed by applying and drying a two-component reactive adhesive using a bar coater so that the thickness after drying would be 3 μm. As this two-component adhesive, a two-component reactive polyurethane adhesive made of Mitsui Chemicals, Inc., “Takelac A-520” (trade name) and “Takenate A-50” (trade name) was used. .

  After the obtained laminate film was cut into a predetermined shape, a cylindrical body part was manufactured by heat-sealing the overlapped part. This heat sealing was performed between the inner CPP layer and the outer CPP layer. Next, the cylindrical trunk | drum part was mounted | worn with the mandrel for tube container shaping | molding, and the shoulder part provided with the extraction part was joined to the end of the trunk | drum part. The shoulder was formed by compression molding a polypropylene resin. Next, the lid | cover (cap) made from a polypropylene resin was attached to the taking-out part. Next, kneaded wasabi was filled as the contents from the other end portion of the opened body portion, and this end portion was heat sealed by bringing the inner peripheral surfaces of the inner CPP layer into contact with each other. Thus, a laminated tube container (4-1) filled with kneaded wasabi was obtained. A sample for measurement was cut out from the laminate tube container (4-1), and the oxygen permeability and moisture permeability before and after the stretching treatment were measured. In addition, the extending | stretching process was performed by hold | maintaining the state which extended | stretched the sample 5% in the bag longitudinal direction for 10 second.

  The body part of the laminate tube container (4-1) was sandwiched between fingers, the finger was reciprocated along the longitudinal direction of the body part while applying a certain force, and a squeeze test was performed. After 5,000 round trips, the kneaded wasabi of the contents was taken out. A sample for measurement was cut out from the laminate tube container (4-1) after the squeeze test, and the oxygen permeability and moisture permeability of the sample were measured.

<Examples 4-2 to 4-33 and Comparative Examples 4-1 to 4-6)>
Other than replacing multilayer structure (2-1-2) with multilayer structures (2-2-2) to (2-33-2) and (C2-1-2) to (C2-6-2) Are the same as the production of the laminated tube container (4-1) of Example 4-1, and produced the laminated tube containers (4-2) to (4-33) and (C4-1) to (C4-6). did. The obtained laminated tube container was evaluated in the same manner as the laminated tube container (4-1). Table 6 shows the numbers of the multilayer structures used for the production of the laminate tube container and the evaluation results.

  As shown in Table 6, the laminated tube container of the present invention maintained the oxygen barrier property and the water vapor barrier property at a high level even under strong physical stress.

[Example 5] Pouch with spout <Example 5-1>
Two laminates having a size of 20 cm × 13 cm were cut from the multilayer structure (2-1-2) obtained in Example 2-1. Subsequently, the two laminates that were cut were overlapped so that the CPP layer was inside, the outer periphery was heat-sealed with a width of 0.5 cm, and a polypropylene spout was attached by heat sealing. In this manner, a flat pouch-type pouch with a spout (5-1) was produced. A sample for measurement was cut out from the pouch (5-1), and the oxygen permeability and moisture permeability before and after the stretching treatment were measured. In addition, the extending | stretching process was performed by hold | maintaining the state which extended | stretched the sample 5% in the bag longitudinal direction for 10 second.

  The pouch (5-1) was dropped 5 times from a height of 1.5 m with the side of the pouch (heat seal side) down, and a bending test was performed. A sample for measurement was cut out from the pouch (5-1) after the bending test, and the oxygen permeability and moisture permeability of the sample were measured.

<Examples 5-2 to 5-33 and Comparative Examples 5-1 to 5-6>
Other than replacing the multilayer structure (2-1-2) with the multilayer structures (2-2-2) to (2-33-2), (C2-1-2) to (C2-6-2) Produced pouches with a spout (5-2) to (5-33) and (C5-1) to (C5-6) in the same manner as in the production of the pouch (5-1) of Example 5-1. About the obtained pouch, it evaluated similarly to pouch (5-1). Table 7 shows the numbers of the multilayer structures used for the production of the pouch and the evaluation results.

  As shown in Table 7, the spouted pouch of the present invention maintained oxygen barrier properties and water vapor barrier properties at a high level even when subjected to strong physical stress.

[Example 6] Flat pouch <Example 6-1>
Two laminates having a size of 20 cm × 13 cm were cut from the multilayer structure (2-1-2) produced in Example 2-1. Subsequently, the two laminated bodies cut were overlapped so that the CPP layer was inside, and the outer periphery of the three sides was heat-sealed with a width of 0.5 cm. Further, a pouch opening having a length of 30 mm was formed at the end of the opening on the other side. Next, a polytetrafluoroethylene sheet having a width of 30 mm was inserted into the end of the opening, and heat sealing was performed in that state. After heat sealing, a flat pouch (6-1) was obtained by drawing out a sheet of polytetrafluoroethylene. A sample for measurement was cut out from the flat pouch (6-1), and the oxygen permeability and moisture permeability before and after the stretching treatment were measured. In addition, the extending | stretching process was performed by hold | maintaining the state which extended | stretched the sample 5% in the longitudinal direction for 10 second.

  The flat pouch (6-1) was filled with 400 mL of distilled water, the headspace portion was reduced as much as possible, and then the opening was heat sealed to seal the filled distilled water so that it did not leak. The side surface (heat seal side) of the flat pouch (6-1) sealed with distilled water was turned down, dropped 5 times from a height of 1.5 m, and a bending test was performed. A sample for measurement was cut out from the flat pouch (6-1) after the bending test, and oxygen permeability and moisture permeability were measured.

<Examples 6-2 to 6-33 and Comparative Examples 6-1 to 6-6>
Other than replacing multilayer structure (2-1-2) with multilayer structures (2-2-2) to (2-33-2) and (C2-1-2) to (C2-6-2) Produced flat pouches (6-2) to (6-33) and (C6-1) to (C6-6) in the same manner as in the production of the flat pouch (6-1) of Example 6-1. The obtained flat pouch was evaluated in the same manner as the flat pouch (6-1). Table 8 shows the numbers and evaluation results of the multilayer structures used for the production of the pouch.

  As shown in Table 8, the flat pouch of the present invention maintained the oxygen barrier property and the water vapor barrier property at a high level even under strong physical stress.

<Examples 6-34 to 6-43>
The multilayer structure (2-1-2) of Example 2-1 except that the first coating liquids (U-34) to (U-43) were used instead of the first coating liquid (U-1). In the same manner as in the production, multilayer structures (2-34-2) to (2-43-2) were obtained. Production of flat pouch (6-1) of Example 6-1 except that the multilayer structure (2-1-2) was replaced with multilayer structures (23-3-2) to (2-43-2) Flat pouches (6-34) to (6-43) were produced in the same manner as described above.

<Comparative Examples 6-7 and 6-8>
The multilayer structure (2-1-2) of Example 2-1 except that the first coating liquids (CU-1) and (CU-8) were used instead of the first coating liquid (U-1). In the same manner as in the production, multilayer structures (C2-7-2) and (C2-8-2) were obtained. Production of flat pouch (6-1) in Example 6-1 except that multilayer structure (2-1-2) was replaced with multilayer structures (C2-7-2) and (C2-8-2) In the same manner, flat pouches (C6-7) and (C6-8) were produced.

Table 9 shows the conditions for forming the layer (CY) of the comparative example corresponding to the layer (Y) and the layer (Y) in the examples. In addition, the symbol in Table 9 represents the following substances.
PVA: polyvinyl alcohol (PVA124 manufactured by Kuraray Co., Ltd.)

Multilayer structures (2-34-2) to (243-2) and (C2-7-2) obtained in Examples 6-34 to 6-43, Comparative Examples 6-7 and 6-8 , And (C2-8-2) are cut into a width of 120 mm × 120 mm, two multilayer structures are overlaid so that the CPP is on the inside, and a rectangular pouch is formed by heat-sealing the three sides of the rectangle. 100 g of water was filled in the pouch. Subsequently, the obtained pouch was subjected to a retort treatment (hot water storage type) under the following conditions.
Retort processing equipment: Flavor Ace RSC-60 manufactured by Nisaka Manufacturing Co., Ltd.
Temperature: 130 ° C
Time: 30 minutes Pressure: 0.21 MPaG

  Immediately after the retort treatment, a measurement sample was cut out from the pouch, and the oxygen permeability of the sample was measured by the method described above. The results are shown in Table 10.

  As apparent from Table 10, the flat pouch of the example was able to maintain the gas barrier property at a high level before and after the retort treatment.

[Example 7] Pouch with gusset <Example 7-1>
The multilayer structure (2-1-2) produced in Example 2-1 was cut to produce two rolls (450 mm wide × 200 m long roll and 60 mm wide × 200 m long roll). Subsequently, these rolls are supplied to a standing bag three-way seal bag combined bag making machine (manufactured by Seibu Kikai Co., Ltd.), and the unstretched polypropylene portion is heat-sealed to form a pouch with a bottom gusset (bottom gusset) (130 mm wide, long 200 mm, gusset folding width of bottom gusset part 25 mm). At this time, two side wall portions were obtained by cutting a roll having a width of 450 mm, and a bottom wall portion (gusset portion) was obtained by cutting a roll having a width of 60 mm. Next, a polytetrafluoroethylene sheet having a width of 30 mm was inserted into the end of one side (opening) that was not heat-sealed, and after heat-sealing in that state, the polytetrafluoroethylene sheet was removed. . Thus, a gusseted pouch (7-1) having a pouch opening of 30 mm in length was produced. A sample for measurement was cut out from the pouch (7-1). About this sample, the oxygen permeability before and behind the extending | stretching process and the water vapor transmission rate were measured by the method mentioned above. In addition, the extending | stretching process was performed by hold | maintaining the state which extended | stretched the sample 5% in the bag longitudinal direction for 10 second.

  The pouch (7-1) was filled with 500 mL of distilled water, the head space portion was reduced as much as possible, and then the opening was heat sealed to seal the filled distilled water so that it did not leak. The side of the pouch (7-1) sealed with distilled water (heat seal side) was turned down and dropped 5 times from a height of 1.5 m, and a bending test was performed. A sample for measurement was cut out from the pouch (7-1) after the bending test, and oxygen permeability and moisture permeability were measured.

<Examples 7-2 to 7-33 and Comparative Examples 7-1 to 7-6>
Other than replacing multilayer structure (2-1-2) with multilayer structures (2-2-2) to (2-33-2) and (C2-1-2) to (C2-6-2) Produced pouches with gussets (7-2) to (7-33) and (C7-1) to (C7-6) in the same manner as in the production of the pouch (7-1) of Example 7-1. About the obtained pouch, it evaluated similarly to pouch (7-1). Table 11 shows the numbers of the multilayer structures used for the production of the pouch and the evaluation results.

  As shown in Table 11, the gusseted pouch of the present invention maintained the oxygen barrier property and the water vapor barrier property at a high level even when subjected to strong physical stress.

[Example 8] Infusion bag <Example 8-1>
Two multilayer structures of 12 cm × 10 cm were cut out from the multilayer structure (2-1-2) produced in Example 2-1. Subsequently, the two multilayer structures cut out were overlapped so that the CPP layer was inside, and the periphery was heat sealed, and a polypropylene spout (plug member) was attached by heat sealing. Thus, an infusion bag (8-1) having the same structure as that shown in FIG. 5 was produced. A sample for measurement was cut out from the infusion bag (8-1), and the oxygen permeability and moisture permeability before and after the stretching treatment were measured. In addition, the extending | stretching process was performed by hold | maintaining the state which extended | stretched the sample 5% in the bag longitudinal direction for 10 second.

  The infusion bag (8-1) was filled with 100 mL of distilled water, and then dropped 5 times from a height of 1.5 m with the side surface (heat seal side) down, and a bending test was performed. A sample for measurement was cut out from the infusion bag (8-1) after the bending test, and the oxygen permeability and moisture permeability of the sample were measured.

<Examples 8-2 to 8-33 and Comparative Examples 8-1 to 8-6>
Other than replacing multilayer structure (2-1-2) with multilayer structures (2-2-2) to (2-33-2) and (C2-1-2) to (C2-6-2) In the same manner as in the preparation of the infusion bag (8-1) of Example 8-1, infusion bags (8-2) to (8-33) and (C8-1) to (C8-6) were prepared. About the obtained infusion bag, it evaluated similarly to the infusion bag (8-1). Table 12 shows the numbers and evaluation results of the multilayer structures used for producing the infusion bag.

  As shown in Table 12, the infusion bag of the present invention maintained oxygen barrier properties and water vapor barrier properties at a high level even when subjected to strong physical stress.

[Example 9] Paper container <Example 9-1>
An unstretched PP layer (20 μm in thickness) was formed on both sides of the paperboard by extrusion-coating and laminating polypropylene resin (PP) on both sides of the 400 g / m ² paperboard. Thereafter, an adhesive layer was formed on the surface of one PP layer, and the multilayer structure (2-1-1) obtained in Example 2-1 was laminated thereon. The adhesive layer was formed using the adhesive described in Example 2-1. Next, the adhesive was applied to the surface of the multilayer structure, and the multilayer structure and CPP 50 were bonded together. In this way, a multilayer structure (9-1-2) having a configuration of (outer) PP / paperboard / PP / multilayer structure / CPP (inner side) was produced. The multilayer structure (2-1-1) was laminated so that the layer (Y) was closer to the paperboard than the substrate (X). Next, by forming the multilayer structure (9-1-2) so that the CPP of the multilayer structure (9-1-2) faces the inside of the container, the brick type paper container (9-1) (Internal volume 500 mL) was produced.

  A circular sample (diameter: 6.5 cm) that does not include a bent portion is cut out from the flat container partition wall that forms the side surface of the brick-type paper container (9-1), and the oxygen permeability and moisture permeability before and after the stretching treatment are obtained. It was measured. In addition, the extending | stretching process was performed by hold | maintaining the state which extended | stretched the sample 5% in the longitudinal direction for 10 second.

<Examples 9-2 to 9-33 and Comparative Examples 9-1 to 9-6>
Other than replacing multilayer structure (2-1-1) with multilayer structures (2-2-1) to (23-3-1) and (C2-1-1) to (C2-6-1) Produced paper containers (9-2) to (9-33) and (C9-1) to (C9-6) in the same manner as in the production of the paper container (9-1) of Example 9-1. The obtained paper container was evaluated in the same manner as the paper container (9-1). Table 13 shows the numbers and evaluation results of the multilayer structures used for producing the paper containers.

  As shown in Table 13, the paper container of the present invention maintained oxygen barrier properties and water vapor barrier properties at high levels even when subjected to strong physical stress.

A circular sample (diameter: 6.5 cm) was cut out from the portion including the bent portion of the paper container (9-1). Next, the cut circular sample is placed on a circle having a diameter of 4.5 cm opened in a 10 cm square aluminum foil (thickness 30 μm), and a two-component curable epoxy adhesive (between the sample and the aluminum foil) Sealed with “Araldite” (registered trademark) manufactured by Nichiban Co., Ltd. As a result of measuring the oxygen permeability and moisture permeability of the sample, the oxygen permeability was 0.7 mL / (m ² · day · atm), and the moisture permeability was 0.4 g / (m ² · day). The paper container of the present invention maintained oxygen barrier properties and water vapor barrier properties at a high level even when subjected to strong physical stress during bending deformation.

[Example 10] Strip tape On the multilayer structure (2-1-1) produced in Example 2-1, the two-component adhesive used in Example 4-1 was applied and dried. A laminate was obtained by laminating with CPP50. Subsequently, on the multilayer structure of the laminate, the two-component adhesive was applied and dried, and this was laminated with CPP50. In this way, a multilayer structure (10-1-2) having a configuration of CPP / adhesive layer / multilayer structure / adhesive layer / CPP was obtained. This multilayer structure (10-1-2) was cut into strips to produce a strip tape.

  Next, a paper container was produced in the same manner as in Example 9-1. However, in Example 10, after heat-sealing the CPP and the polypropylene resin layer (PP) at the center of one of the four side surfaces, the heat-sealed portion at the center of the side surface is further replaced with the multilayer structure (10 It was covered with a strip tape consisting of -1-2). And the multilayer structure was bonded together by heating the part of a strip tape from the inside of a paper container, and the paper container (10-1) was produced.

A circular sample (diameter: 6.5 cm) was cut out from the paper container (10-1) so that the ratio of the pasted portion at the center of the side surface of the paper container to the sample was maximized. Next, the cut circular sample is placed on a circle having a diameter of 4.5 cm opened in a 10 cm square aluminum foil (thickness 30 μm), and a two-component curable epoxy adhesive (between the sample and the aluminum foil) Sealed with “Araldite” (registered trademark) manufactured by Nichiban Co., Ltd. As a result of measuring the oxygen permeability and moisture permeability of the sample, the oxygen permeability of the bonded portion of the paper container (10-1) was 0.6 mL / (m ² · day · atm), and the moisture permeability was 0.2 g / (M ² · day). Thus, the strip tape of the present invention maintained high oxygen barrier properties and water vapor barrier properties even after heat sealing.

[Example 11] Container lid <Example 11-1>
A circular multilayer structure having a diameter of 100 mm was cut out from the multilayer structure (2-1-2) produced in Example 2-1, and used as a container lid. In addition, as a container body, a container with a flange (manufactured by Toyo Seikan Co., Ltd., “High Reflex” (registered trademark), “HR78-84” (trade name)) was prepared. This container has a cup shape with an upper surface diameter of 78 mm and a height of 30 mm. The upper surface of the container is open, and the width of the flange portion formed on the periphery thereof is 6.5 mm. The container is constituted by a laminate of three layers of olefin layer / steel layer / olefin layer. Next, a container (11-1) with a lid was obtained by filling the container body with water almost completely and heat-sealing the lid on the flange. At this time, the lid member was heat-sealed by placing the non-stretched polypropylene layer of the lid member in contact with the flange portion. In addition, the oxygen permeability of the said container by the measuring method used in a present Example was substantially zero. A measurement sample was cut out from the lid of the lidded container (11-1), and the oxygen permeability and moisture permeability before and after the stretching treatment were measured. In the stretching process, the sample was stretched 5% in the uniaxial direction by holding for 10 seconds.

  Ten containers (11-1) with a lid were placed in a cardboard box (15 × 35 × 45 cm). A buffer material was packed in the gap between the lidded container (11-1) and the cardboard box. Then, a cardboard box containing the lidded container (11-1) was loaded on a truck, and a transportation test was performed in which 10 reciprocations were made between Okayama Prefecture and Tokyo. The container with lid (11-1) after the transportation test was left at 20 ° C. and 65% RH for 1 hour, and then a hole was made in the bottom of the container body to extract water. Subsequently, a sample for measurement was cut out from the lid of the lidded container (11-1), and the oxygen permeability and moisture permeability of the sample were measured.

<Examples 11-2 to 11-33 and Comparative Examples 11-1 to 11-6>
Other than replacing multilayer structure (2-1-2) with multilayer structures (2-2-2) to (2-33-2) and (C2-1-2) to (C2-6-2) Produced the containers (11-2) to (11-33) and (C11-1) to (C11-6) with the lid in the same manner as the production of the container (11-1) with the lid of Example 11-1. . About the obtained container with a lid | cover, it evaluated similarly to the container (11-1) with a lid | cover. Table 14 shows the numbers and evaluation results of the multilayer structures used for producing the lidded container.

  As shown in Table 14, the lidded container of the present invention maintained oxygen barrier properties and water vapor barrier properties at high levels even when subjected to strong physical stress.

[Example 12] In-mold label container For each of two CPPs 100, a two-component adhesive ("A-" used in Example 4-1 was used using a bar coater so that the thickness after drying was 3 µm. 520 "and" A-50 ") were applied and dried. Next, two CPPs and the multilayer structure (2-1-1) of Example 2-1 were laminated, and allowed to stand at 40 ° C. for 5 days for aging. In this way, a multilayer label (12-1-2) having a structure of CPP / adhesive layer / base material (X) / layer (Y) / adhesive layer / CPP was obtained.

The multilayer label (12-1-2) was cut according to the shape of the inner wall surface of the female mold part of the container mold, and attached to the inner wall surface of the female mold part. Next, the male part was pushed into the female part. Next, melted polypropylene (“EA7A” of “NOVATEC” (registered trademark) manufactured by Nippon Polypro Co., Ltd.) was injected into the cavity between the male part and the female part at 220 ° C. Thus, injection molding was implemented and the target container (12-1-3) was shape | molded. The container body had a thickness of 700 μm and a surface area of 83 cm ² . The whole outside of the container is covered with the multilayer label (12-1-2), the joint is overlapped with the multilayer label (12-1-2), and the part where the multilayer label (12-1-2) does not cover the outside of the container is There wasn't. At this time, the appearance of the container (12-1-3) was good.

A sample for measurement was cut out from the body of the container so as not to include the joint of the multilayer label, and the oxygen permeability and moisture permeability of the sample were measured. As a result, the oxygen permeability was 0.4 mL / (m ² · day · atm), and the moisture permeability was 0.2 g / (m ² · day). The in-mold label container of the present invention achieved high levels of oxygen barrier properties and water vapor barrier properties even when subjected to strong physical stress accompanying pressure and heat during in-mold label molding.

Example 13 Extrusion Coat Lamination After forming an adhesive layer on the layer (Y) on the multilayer structure (2-1-1) in Example 2-1, a polyethylene resin (density: 0.917 g / cm ³⁾ , Melt flow rate; 8 g / 10 min) was extruded and laminated at 295 ° C. on the adhesive layer so as to have a thickness of 20 μm. In this way, a multilayer structure (13-1-2) having a structure of base material (X) / layer (Y) / adhesive layer / polyethylene was obtained. The adhesive layer was formed by applying a two-component adhesive using a bar coater so that the thickness after drying was 0.3 μm and drying. This two-part adhesive includes “Takelac” (registered trademark) “A-3210” manufactured by Mitsui Chemicals, Inc. and “Takenate” (registered trademark) “A-3070” manufactured by Mitsui Chemicals, Inc. A two-component reactive polyurethane adhesive was used.

The oxygen permeability and moisture permeability of the multilayer structure (13-1-2) were measured by the method described above. As a result, the oxygen permeability was 0.4 mL / (m ² · day · atm), and the moisture permeability was 0.2 g / (m ² · day). Thus, by using the multilayer structure used in the present invention, a high oxygen barrier property and a water vapor barrier property were achieved even after being subjected to a strong physical stress accompanying pressure and heat during extrusion coating.

[Example 14] Vacuum insulator <Example 14-1>
On the CPP60, the two-component reactive polyurethane adhesive used in Example 2-1 was applied so that the thickness after drying was 3 μm, and dried to form an adhesive layer. A laminate (14-1-1) was obtained by laminating this CPP and the PET layer of the multilayer structure (2-1-2) produced in Example 2-1. Subsequently, the adhesive layer was formed by applying the two-component reactive polyurethane adhesive on the ONY so that the thickness after drying was 3 μm and drying. Then, the multilayer structure (14-1-2) having a structure of CPP / adhesive layer / multilayer structure / adhesive layer / ONY is formed by laminating the ONY and the laminate (14-1-1). Obtained.

  The multilayer structure (14-1-2) was cut to obtain two laminates having a size of 70 cm × 30 cm. The two laminates were overlapped so that the CPP layers were the inner surfaces, and the three sides were heat-sealed with a width of 10 mm to produce a three-sided bag. Next, the heat insulating core material was filled from the opening of the three-sided bag, and the three-sided bag was sealed at 20 ° C. and an internal pressure of 10 Pa using a vacuum packaging machine. Thus, the vacuum heat insulating body (14-1) was obtained. Silica fine powder was used for the heat insulating core material. The vacuum insulator (14-1) was allowed to stand for 360 days under the conditions of 40 ° C. and 15% RH, and then the pressure inside the vacuum insulator was measured using a Pirani vacuum gauge. As a result, it was 37.0 Pa.

  A sample for measurement was cut out from the vacuum insulator (14-1), and the oxygen permeability and moisture permeability before and after the stretching treatment were measured. In the stretching process, the sample was stretched by 5% in one direction corresponding to the major axis direction and held for 10 seconds.

<Examples 14-2 to 14-33 and Comparative Examples 14-1 to 14-6>
Other than replacing multilayer structure (2-1-2) with multilayer structures (2-2-2) to (2-33-2) and (C2-1-2) to (C2-6-2) Were produced in the same manner as the production of the vacuum heat insulator (14-1) of Example 14-1, and vacuum heat insulators (14-2) to (14-33) and (C14-1) to (C14-6) were produced. did. About the obtained vacuum heat insulating body, it evaluated similarly to a vacuum heat insulating body (14-1). Table 15 shows the numbers of the multilayer structures used for the production of the vacuum heat insulator and the evaluation results.

  As shown in Table 15, the vacuum insulator of the present invention maintained the oxygen barrier property and the water vapor barrier property at a high level even when subjected to strong physical stress.

[Example 15] Effect of packing <Examples 15-1 to 15-8>
The flat pouch (6-1) described in Example 6-1 was filled with 500 mL of a liquid material. As a liquid substance, 1.5% ethanol aqueous solution (Example 15-1), edible vinegar (Example 15-2), pH 2 citric acid aqueous solution (Example 15-3), edible oil (Example 15-4) A ketchup (Example 15-5), soy sauce (Example 15-6), ginger paste (Example 15-7), and a liquid containing 200 g of mandarin orange (Example 15-8) were used. The produced flat pouch was stored for 6 months under conditions of 23 ° C. and 50% RH. A sample for measurement was cut out from the flat pouch after storage, and the oxygen permeability of the sample was measured. The oxygen permeability of the samples of Examples 15-1 to 15-8 was 0.2 mL / (m ² · day · atm).

<Examples 15-9 to 15-16>
The lidded container (11-1) described in Example 11-1 was filled with a liquid material and sealed. As liquids, 1.5% ethanol aqueous solution (Example 15-9), edible vinegar (Example 15-10), pH 2 citric acid aqueous solution (Example 15-11), edible oil (Example 15-12) , Ketchup (Example 15-13), soy sauce (Example 15-14), ginger paste (Example 15-15), and a liquid containing 100 g of mandarin orange (Example 15-16) were used. The produced container with a lid was stored for 6 months under conditions of 23 ° C. and 50% RH. A sample for measurement was cut out from the lid of the container with lid after storage, and the oxygen permeability of the sample was measured. The oxygen permeability of the samples of Examples 15-9 to 15-16 was 0.2 mL / (m ² · day · atm).

  As is clear from Examples 15-1 to 15-16, the packaging material using the multilayer structure of the present invention showed good barrier performance even after a storage test was performed in a state where the food was filled.

[Example 16] Effect of retort treatment <Examples 16-1 to 16-3>
The flat pouch (6-1) described in Example 6-1 was filled with 500 mL of water, and 30 at 120 ° C. and 0.15 MPaG using a retort processing apparatus (manufactured by Nisaka Seisakusho, flavor ace RCS-60). Minutes, hydrothermal retort treatment (Example 16-1), 120 ° C., 0.15 MPaG for 30 minutes, steam retort treatment (Example 16-2), 120 ° C., 0.15 MPaG for 30 minutes, steam retort The treatment (Example 16-3) was performed. As a result, the oxygen permeability of the samples of Examples 16-1 to 16-3 was 0.4 mL / (m ² · day · atm).

  As is clear from Examples 16-1 to 16-3, the packaging material using the multilayer structure of the present invention showed good barrier performance even after retorting.

  The multilayer structure of the present invention is excellent in gas barrier properties and water vapor barrier properties. The multilayer structure of the present invention can maintain gas barrier properties and water vapor barrier properties at a high level even when subjected to physical stress such as deformation or impact. Therefore, the multilayer structure of the present invention can be preferably used as a packaging material for foods, medicines, medical equipment, industrial materials, clothing and the like.

DESCRIPTION OF SYMBOLS 10 Vertical bag making filling sealing bag 11 Multilayer structure 11a End part 11b, 331 Body part 131,132,410a, 410b, 631,632 Film material 101 Vacuum packaging bag 111,11c, 411,412,413,414,611 Part 112 Central part 150 Contents 20 Flat pouch 301 Laminate tube container 310 Laminate film 311 End seal part 312 Side seal part 320,420 Partition 332 Shoulder part 341 Base part 342 Extraction part 401 Infusion bag 431 Bag body 432 Cap member 433 Hanging hole 501 Laminated body 502 Resin film 503 Laminated film (multilayer structure)
510 Paper Container 511 Window 601 602 Vacuum Insulator 610 Coating Material 651 652 Core Material

Claims (10)

A packaging material comprising a multilayer structure including a substrate (X) and a layer (Y) laminated on the substrate (X),
The layer (Y) contains a metal oxide (A), a phosphorus compound (B), and a cation ( _Z ) having an ionic value (F _Z ) of 1 or more and 3 or less,
The layer (Y) includes a reaction product (D) obtained by a reaction between the metal oxide (A) and the phosphorus compound (B),
The phosphorus compound (B) is at least one compound selected from the group consisting of phosphoric acid, polyphosphoric acid, phosphorous acid, phosphonic acid, phosphonous acid, phosphinic acid, phosphinic acid, and derivatives thereof ,
The metal atom (M) constituting the metal oxide (A) is aluminum,
The cation (Z) is lithium ion, sodium ion, potassium ion, magnesium ion, calcium ion, titanium ion, zirconium ion, lanthanoid ion, vanadium ion, manganese ion, iron ion, cobalt ion, nickel ion, copper ion, At least one cation selected from the group consisting of zinc ions, boron ions, and ammonium ions,
In the layer (Y), the number of moles (N _M ) of the metal atoms (M) constituting the metal oxide (A) and the number of moles of phosphorus atoms (N _P ) derived from the phosphorus compound (B) Satisfy the relationship 0.8 ≦ N _M / N _P ≦ 4.5, and in the layer (Y), the number of moles (N _M ) and the number of moles of the cation (Z) (N _Z ) And the ion value (F _Z ) satisfying the relationship of 0.001 ≦ F _Z × N _Z / N _M ≦ 0.60. In the layer (Y), the number of moles of the cation (Z) (N _Z ), the ionic value (F _Z ) of the cation (Z), and the mole of phosphorus atoms derived from the phosphorus compound (B). The packaging material according to claim 1, wherein the number (N _P ) satisfies a relationship of 0.0008 ≦ F _Z × N _Z / N _P ≦ 1.35 . In the infrared absorption spectrum of the layer (Y), the maximum absorption wave number in the range of 1,080～1,130Cm ^-1 in the region of 800~1,400cm ^-1, packaging material according to claim 1 or 2 .   The packaging according to any one of claims 1 to 3, wherein the substrate (X) includes at least one layer selected from the group consisting of a thermoplastic resin film layer, a paper layer, and an inorganic vapor deposition layer. Wood.   The packaging material according to any one of claims 1 to 4, further comprising a layer formed by extrusion coating lamination. The packaging material according to any one of claims 1 to 5, wherein an oxygen permeability of the multilayer structure under conditions of 20 ° C and 85% RH is 2 mL / (m ² · day · atm) or less. The multilayer structure was held at 23 ° C. and 50% RH for 5 seconds with the multilayer structure stretched for 5 seconds, and the oxygen permeability of the multilayer structure at 20 ° C. and 85% RH was 4 mL / (m The packaging material according to any one of claims 1 to 6, which is ² · day · atm) or less.   In any one of Claims 1-7 which is a vertical bag-filling sealing bag, a vacuum packaging bag, a pouch, a laminate tube container, an infusion bag, a paper container, a strip tape, a container lid, or an in-mold label container. The packaging material described.   The product in which the packaging material of any one of Claims 1-8 is used for at least one part. The product according to claim 9, wherein the product includes a content, the content is a core, the inside of the product is decompressed, and functions as a vacuum heat insulator.

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